You are given n numbers a1, a2, ..., an. You can perform at most k operations. For each operation you can multiply one of the numbers by x. We want to make <image> as large as possible, where <image> denotes the bitwise OR. 

Find the maximum possible value of <image> after performing at most k operations optimally.

Input

The first line contains three integers n, k and x (1 ≤ n ≤ 200 000, 1 ≤ k ≤ 10, 2 ≤ x ≤ 8).

The second line contains n integers a1, a2, ..., an (0 ≤ ai ≤ 109).

Output

Output the maximum value of a bitwise OR of sequence elements after performing operations.

Examples

Input

3 1 2
1 1 1


Output

3


Input

4 2 3
1 2 4 8


Output

79

Note

For the first sample, any possible choice of doing one operation will result the same three numbers 1, 1, 2 so the result is <image>. 

For the second sample if we multiply 8 by 3 two times we'll get 72. In this case the numbers will become 1, 2, 4, 72 so the OR value will be 79 and is the largest possible result.

    		import java.awt.List;
    		import java.io.*;
    		import java.util.*;

    		
    		
    		/*
    		 * 
    		 * daiict
    		 *
    		 * 
    		 * 
    		 */
    		
    		
    		public class prac {
    			FastScanner in;
    			PrintWriter out;
    		
    			static ArrayList[] adj;
    			
    			static int n;
    			static int m;
    			
    			static int[] dp1;
    			static int[] dp2;
    			static int color[];
    			static int visited[];
    			static long[] arr;
    			static long[] brr;
    			static long ans;
    			static int array[];
    			static int pref[];
    			static int tree[];
    			static int maxval = 32;
    		
    			static int sum = 0;
    		//for dfs do not delete
    			static int dir[][] ={{1,0},{0,1},{0,-1},{-1,0},{1,1},{1,-1},{-1,1},{-1,-1}};
    			
    		
    			static long[] seg;
    			static long count = 1;
    			static long mod = (long)1e9 + 7;
    	
    			static int parent[];
    			static int size[];
    			
    			static class Pair implements Comparable<Pair>
    		    {
    				long x;int y;
    				
    		        Pair(long l, int m) {
    		          
    		        	this.x = l;
    		            this.y = m;
    		          
    		        }
    		        
    		        public int compareTo(Pair p) {
    		            if (this.x == p.x) {
    		                return (int)(this.y-p.y);
    		            }
    		            return (int)(this.x - p.x);
    		        }
    		        
    		        public String toString(){
    		        	return x + " " + y;
    		        }
    		        
    		        public boolean equals(Object o){
    		        	if(o instanceof Pair){
    		        		Pair a = (Pair)o;
    		        		
    		        		return this.x == a.x;
    		        	}
    		        	
    		        	return false;
    		        }
    		        
    		        public int hashCode(){
    		        	return new Long(x).hashCode()*31 + new Long(y).hashCode();
    		        }
    		    
    		    }
    		    
    			
    			public static int gcd(int a, int b) {
    				if (b == 0) return a;
    				return gcd(b, a%b);
    			}
    	
    			void build(int n) {  // build the tree
    				  for (int i = n - 1; i > 0; --i) seg[i] = Math.max(seg[i<<1],seg[i<<1|1]);
    				}
     
    			public static void modify(int p, int i,long val,int n) {  // set value at position p
    					if(i == 1){
    						long temp = val;
    						val = seg[p+n] - arr[p] + val;
    						arr[p] = temp;
    					}else{
    						val = Math.min(val, p) + arr[p];
    						brr[p] = val;
    					}
    					
    				  for (seg[p += n] = val; p > 1; p >>= 1) seg[p>>1] = Math.max(seg[p],seg[p^1]);
    				}
     
    				long query(int l, int r,int n) {  // max on interval [l, r)
    				  long res = Integer.MIN_VALUE;
    				  for (l += n, r += n; l < r; l >>= 1, r >>= 1) {
    				    if ((l&1) == 1) res = (int)Math.max(res,seg[l++]);
    				    if ((r&1) == 1) res = (int)Math.max(res,seg[--r]);
    				  }
    				  return res;
    				}
    				
    			public static void update(int x,int val){
    				while(x<=maxval){
    					tree[x] += val;
    					x = (x&-x);
    				}
    			}
    			
    			public static int read(int idx){
    				int sum = 0;
    				
    				while(idx>= 0){
    					sum += tree[idx];
    					idx -= (idx&(-idx));
    				}
    				
    				return sum;
    			}
    			
    			public static int find(int i){
    				if(parent[i] != i){
    					return find(parent[i]);
    				}
    				
    				return i;
    			}
    			
    			public static void union(int a,int b){
    				int x = find(a);
    				int y = find(b);
    				
    				if(x!=y){
    					if(size[x] > size[y]){
    						size[x] += size[y];
    						parent[y] = x;
    					}else{
    						size[y] += size[x];
    						parent[x] = y;
    					}
    				}
    			}
    			
    		    void solve() throws NumberFormatException, IOException {
    		 
    		    	//Scanner in = new Scanner(System.in);
    		    	
    		    	int n = in.nextInt();
    		    	int k = in.nextInt();
    		    	int x = in.nextInt();
    		    	
    		    	long a = 1;
    		    	
    		    	while(k-->0){
    		    		a *= x;
    		    	}
    		    	
    		    	long p[] = new long[n];
    		    	long s[] = new long[n];
    		    	
    		    	long arr[] = new long[n];
    		    	
    		    	for(int i = 0;i<n;i++)
    		    	{
    		    		arr[i] = in.nextLong();
    		    	}
    		    	
    		    	p[0] = arr[0];
    		    	s[n-1] = arr[n-1];
    		    	
    		    	for(int i = 1;i<n;i++){
    		    		p[i] = p[i-1] | arr[i];
    		    	}
    		    	
    		    	for(int i = n-2;i>=0;i--){
    		    		s[i] = s[i+1] | arr[i];
    		    	}
    		    	
    		    	long ans = 0;
    		    	
    		    	if(n>1){

        		    	ans = Math.max(ans, (arr[0]*a)|s[1]);
        		    	ans = Math.max(ans, (arr[n-1]*a)|p[n-2]);
    		    	}else{
    		    		ans = (arr[0]*a);
    		    	}
    		    	
    		    	for(int i = 1;i<n-1;i++){
    		    		ans = Math.max(ans, p[i-1] | (arr[i]*a) | s[i+1]);
    		    	}
    		    	
    		    	out.println(ans);
    		    	
    		    	
	    
    		    }
    		    
    		    public static int fact(int a,int b){
    		    	if(b == 0){
    		    		return 1;
    		    	}
    		    	
    		    	return a*fact(a-1,b-1)/b;
    		    }
    		    
    		    public static void ddfss(int i,int p){
    		    	
    		    	array[i] = color[p];
    		    	
    		    	for(int j = 0;j<adj[i].size();j++){
    		    		if((int)adj[i].get(j) != p){
    		    			
    		    			ddfss((int)adj[i].get(j),i);
    		    		}
    		    	}
    		    }
    		    
    		    public static void ddfs(int i,int p){

    		    	//System.out.println(i + " " +p);
    		    	
    		    	if(color[i] != array[i]){
    		    		sum++;
    		    	//	System.out.println(i + "dd");
    		    		ddfss(i,p);
    		    		
    		    	}
	
    		    	for(int j = 0;j<adj[i].size();j++){
    		    		if((int)adj[i].get(j) != p){
    		    			ddfs((int)adj[i].get(j),i);
    		    		}
    		    	}
    		    	
    		    }
    		    
    		    public static long invcount(int arr[]){
    		    	if(arr.length<2){
    		    		return 0;
    		    	}
    		    	
    		    	int mid = (arr.length + 1)/2;
    		    	
    		    	int left[] = Arrays.copyOfRange(arr, 0,mid);
    		    	int right[] = Arrays.copyOfRange(arr, mid, arr.length);
    		    	
    		    	return invcount(left)+invcount(right)+merge(arr,left,right);
    		    	
    		    }
    		    
    		    public static long merge(int arr[],int left[],int right[]){
    		    	long count = 0;
    		    	
    		    	int i = 0;
    		    	int j = 0;
    		    	
    		    	while(i<left.length || j < right.length){
    		    		
    		    		if(i == left.length){
    		    			arr[i+j] = right[j];
    		    			j++;
    		    		}else if(j == right.length){
    		    			arr[j+i] = left[i];
    		    			i++;
    		    		}else{
    		    			if(left[i] <= right[j]){
    		    				arr[i+j] = left[i];
    		    				i++;
    		    			}else{
    		    				arr[i+j] = right[j];
    		    				j++;
    		    				count += left.length-i;
    		    			}
    		    		}
    		    		
    		    	}
    		    	
    		    	return count;
    		    }
    		    
    		  
    		    
    		    /**
    		     * 
    		     * @param div
    		     * @param left
    		     * @param right
    		     * @param value
    		     * @return the smallest index i which a[i] >= value in range [left, right) if exists, otherwise return -1
    		     */
    		    int ff(int[] div, int left, int right, int value) {
    		        int low = left;
    		        int high = right;
    		        
    		        if(value > div[right-1]){
    		        	return left;
    		        }
    		        
    		        while (low != high) {
    		            int mid = (low + high) / 2;
    		            if (div[mid] < value) {
    		                low = mid + 1;
    		            } else {
    		                high = mid;
    		            }
    		        }
    		        if (low == right) {
    		            return low;
    		        }
    		        return low;
    		    } 
    		   
    		    /**
    		     * 
    		     * @param div
    		     * @param left
    		     * @param right
    		     * @param value
    		     * @return greatest index i which a[i] <= value in range [left, right) if exists, otherwise return a number out of [left, right)
    		     */
    		    int ffff(int[] div, int left, int right, int value) {
    		        
    		    	if(value < div[left]){
    		    		return right-1;
    		    	}
    		    	
    		    	while (left != right) {
    		            int mid = (left + right) >> 1;
    		            if (div[mid] <= value) {
    		                left = mid + 1;
    		            } else {
    		                right = mid;
    		            }
    		        }
    		        if (left < 0) {
    		            left *= -1;
    		        }
    		        return --left;
    		    }
	    
    		   
    		  
    		
    		    public static String reverse(String s){
    		    	
    		    	String ans = "";
    		    	
    		    	for(int i = s.length()-1;i>=0;i--){
    		    		ans += s.charAt(i);
    		    	}
    		    	
    		    	return ans;
    		    	
    		    }
    			
    			
    		    
    		 
    		    public static long sum(long x){
    		    	return x<10?x:x%10 + sum(x/10);
    		    }
    			
    			public static long gcd(long x, long y) {
    				if (x == 0)
    					return y;
    				else
    					return gcd( y % x,x);
    			}
    			static long inv(long x , long mod)
    			{
    				long r,y;
    				for(r=1,y=mod-2;y!=0;x=x*x%mod,y>>=1)
    				{
    					if((y&1)==1)
    						r=r*x%mod;
    				
    				}
    				return r;
    			}
    			
    			public static long pow(long x,long y,long n){
    				if(y==0)
    					return 1%n;
    				if(y%2==0){
    					long z=pow(x,y/2,n);
    					return (z*z)%n;
    				}
    				return ((x%n)*pow(x,y-1,n))%n;
    			}
    			
    			
    			
    			
    			public static boolean isPrime(int n) {
    				// Corner cases
    				if (n <= 1)
    					return false;
    				if (n <= 3)
    					return true;
    		 
    				// This is checked so that we can skip 
    				// middle five numbers in below loop
    				if (n % 2 == 0 || n % 3 == 0)
    					return false;
    		 
    				for (int i = 5; i * i <= n; i = i + 6)
    					if (n % i == 0 || n % (i + 2) == 0)
    						return false;
    		 
    				return true;
    			}
    			
    		
    			void run() throws NumberFormatException, IOException {
    				in = new FastScanner();
    				out = new PrintWriter(System.out);
    		
    				solve();
    		
    				out.close();
    			}
    		
    			class FastScanner {
    				BufferedReader br;
    				StringTokenizer st;
    		
    				public FastScanner() {
    					br = new BufferedReader(new InputStreamReader(System.in));
    				}
    		
    				String next() {
    					while (st == null || !st.hasMoreTokens()) {
    						try {
    							st = new StringTokenizer(in.br.readLine());
    						} catch (IOException e) {
    							// TODO Auto-generated catch block
    							e.printStackTrace();
    						}
    					}
    					return st.nextToken();
    				}
    		
    				int nextInt() {
    					return Integer.parseInt(next());
    				}
    		
    				long nextLong() {
    					return Long.parseLong(next());
    				}
    		
    				double nextDouble() {
    					return Double.parseDouble(next());
    				}
    			}
    			
    			
    			
    			
    		 
    		
    			public static void main(String[] args) throws NumberFormatException, IOException {
    				new prac().run();
    			}
    		}
    		class Node{
    			String s;
    			int b;
    			
    		}
    		
    		class MyComp implements Comparator<String>{
    		    
    			int c = 0;
    			
    			MyComp(int d){
    				c = d;
    			}
    			
    			@Override
    			public int compare(String a,String b) {
    				
    				// < == -1
    				
    				String arr[] = a.split(" ");
    				String brr[] = b.split(" ");
    				
    				return arr[c].compareTo(brr[c]);
    				
    				
    			}

    			
    		}
    		
    		class MyComp2 implements Comparator<Node>{
    		    
    		
    			
    			@Override
    			public int compare(Node a,Node b) {
    				
    				// < == -1

    				
    				if(a.b > b.b){
    					return -1;
    				}else{
    					return 1;
    				}
    				
    				
    			}

    			
    		}
