Ohana Matsumae is trying to clean a room, which is divided up into an n by n grid of squares. Each square is initially either clean or dirty. Ohana can sweep her broom over columns of the grid. Her broom is very strange: if she sweeps over a clean square, it will become dirty, and if she sweeps over a dirty square, it will become clean. She wants to sweep some columns of the room to maximize the number of rows that are completely clean. It is not allowed to sweep over the part of the column, Ohana can only sweep the whole column.

Return the maximum number of rows that she can make completely clean.

Input

The first line of input will be a single integer n (1 ≤ n ≤ 100).

The next n lines will describe the state of the room. The i-th line will contain a binary string with n characters denoting the state of the i-th row of the room. The j-th character on this line is '1' if the j-th square in the i-th row is clean, and '0' if it is dirty.

Output

The output should be a single line containing an integer equal to a maximum possible number of rows that are completely clean.

Examples

Input

4
0101
1000
1111
0101


Output

2


Input

3
111
111
111


Output

3

Note

In the first sample, Ohana can sweep the 1st and 3rd columns. This will make the 1st and 4th row be completely clean.

In the second sample, everything is already clean, so Ohana doesn't need to do anything.
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Deque;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.PriorityQueue;
import java.util.Queue;
import java.util.Set;
import java.util.SortedMap;
import java.util.StringTokenizer;
import java.util.TreeMap;




public class Main {

	public static void main(String[] args) {

		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		solve(in, out);
		out.close();
	}

	static String reverse(String s) {
		return (new StringBuilder(s)).reverse().toString();
	}

	static void sieveOfEratosthenes(int n, int factors[], ArrayList<Integer> ar) 
    { 
        factors[1]=1;
        int p;
        for(p = 2; p*p <=n; p++) 
        { 
            if(factors[p] == 0) 
            { 
                ar.add(p);
                factors[p]=p;
                for(int i = p*p; i <= n; i += p) 
                    factors[i] = p; 
            } 
        } 
        for(;p<=n;p++){
            if(factors[p] == 0) 
            { 
                ar.add(p);
            } 
        }
    }

	static void sort(int ar[]) {
		int n = ar.length;
		ArrayList<Integer> a = new ArrayList<>();
		for (int i = 0; i < n; i++)
			a.add(ar[i]);
		Collections.sort(a);
		for (int i = 0; i < n; i++)
			ar[i] = a.get(i);
	}

	static void sort1(long ar[]) {
		int n = ar.length;
		ArrayList<Long> a = new ArrayList<>();
		for (int i = 0; i < n; i++)
			a.add(ar[i]);
		Collections.sort(a);
		for (int i = 0; i < n; i++)
			ar[i] = a.get(i);
	}

	static long ncr(long n, long r, long mod) {
		if (r == 0)
			return 1;
		long val = ncr(n - 1, r - 1, mod);
		val = (n * val) % mod;
		val = (val * modInverse(r, mod)) % mod;
		return val;
	}

	public static int convert(String a, String b) {
		int T = 0;
		if (b.charAt(0) == 'P') {
			if (a.charAt(0) == '1' && a.charAt(1) == '2')
				T = 12;
			else
				T = (a.charAt(0) - '0') * 10 + (a.charAt(1) - '0') + 12;
		} else if (b.charAt(0) == 'A') {
			if (a.charAt(0) == '1' && a.charAt(1) == '2')
				T = 0;
			else
				T = (a.charAt(0) - '0') * 10 + (a.charAt(1) - '0');
		}

		T = T * 100 + (a.charAt(3) - '0') * 10 + (a.charAt(4) - '0');
		return T;

	}

	static boolean areBracketsBalanced(String expr) {
		// Using ArrayDeque is faster than using Stack class
		Deque<Character> stack = new ArrayDeque<Character>();

		// Traversing the Expression
		for (int i = 0; i < expr.length(); i++) {
			char x = expr.charAt(i);

			if (x == '(' || x == '[' || x == '{') {
				// Push the element in the stack
				stack.push(x);
				continue;
			}

			// IF current current character is not opening
			// bracket, then it must be closing. So stack
			// cannot be empty at this point.
			if (stack.isEmpty())
				return false;
			char check;
			switch (x) {
			case ')':
				check = stack.pop();
				if (check == '{' || check == '[')
					return false;
				break;

			case '}':
				check = stack.pop();
				if (check == '(' || check == '[')
					return false;
				break;

			case ']':
				check = stack.pop();
				if (check == '(' || check == '{')
					return false;
				break;
			}
		}

		// Check Empty Stack
		return (stack.isEmpty());
	}

	public static int hr(String s) {
		int hh = 0;
		hh = (s.charAt(0) - '0') * 10 + (s.charAt(1) - '0');
		return hh;
	}

	public static int mn(String s) {
		int mm = 0;
		mm = (s.charAt(3) - '0') * 10 + (s.charAt(4) - '0');
		return mm;
	}

	/*
	 * public static void countNumberOfPrimeFactors(){ boolean flag[]=new
	 * boolean[N]; Arrays.fill(flag,true); for(int i=2;i<N;i++){ if(flag[i]){
	 * for(int j=i;j<N;j+=i) { prime[j]++; flag[j]=false; } } } // prime[1]=1; }
	 */

	public static String rev(String s) {
		char[] temp = s.toCharArray();
		for (int i = 0; i < s.length() / 2; i++) {
			char tmp = temp[i];
			temp[i] = temp[s.length() - 1 - i];
			temp[s.length() - 1 - i] = tmp;

		}
		String str = "";
		for (char ch : temp) {
			str += ch;
		}
		return str;
	}

	static boolean isP(String str) {

		// Pointers pointing to the beginning
		// and the end of the string
		int i = 0, j = str.length() - 1;

		// While there are characters to compare
		while (i < j) {

			// If there is a mismatch
			if (str.charAt(i) != str.charAt(j))
				return false;

			// Increment first pointer and
			// decrement the other
			i++;
			j--;
		}

		// Given string is a palindrome
		return true;
	}

	public static boolean isSorted(List<Integer> l) {
		int n = l.size(), i = 0;
		for (i = 1; i < l.size(); i++) {
			if (l.get(i - 1) < l.get(i))
				return false;
		}
		return true;
	}

	public static boolean ln(long n, int c) {
		int l = 0;
		long t = n;
		while (t != 0) {

			t /= 10;
			l++;
		}
		return l == c;
	}
	public static Integer dp[];
	
	
	
	static int getPrev(int n)
	{
	    // Compute c0 and
	    // c1 and store N
	    int temp = n;
	    int c0 = 0;
	    int c1= 0;
	 
	    while((temp & 1) == 1)
	    {
	        c1++;
	        temp = temp >> 1;
	    }
	 
	    if(temp == 0)
	        return -1;
	 
	    while(((temp & 1) == 0) &&
	           (temp!= 0))
	    {
	        c0++;
	        temp = temp >> 1;
	    }
	 
	    // position of rightmost
	    // non-trailing one.
	    int p = c0 + c1;
	 
	    // clears from bit p onwards
	    n = n & ((~0) << (p + 1));
	 
	    // Sequence of (c1+1) ones
	    int mask = (1 << (c1 + 1)) - 1;
	 
	    n = n | mask << (c0 - 1);
	 
	    return n;
	}
	 static boolean isPowerOfTwo(int n)
	    {
	        if (n == 0)
	            return false;
	  
	        while (n != 1) {
	            if (n % 2 != 0)
	                return false;
	            n = n / 2;
	        }
	        return true;
	    }
public static boolean check(int x, int y)
{
 boolean a[]=new boolean[10];
 while(x!=0)
 {
	 a[x%10]=true;
	 x/=10;
 }
 while(y!=0)
 {
	 if(a[y%10]) return true;
	 y/=10;
 }
 return false;
	
}
	




	public static void solve(InputReader sc, PrintWriter pw) {
//		int t=sc.nextInt();
//		while(t-->0) {
		
//		int nn=sc.nextInt();
//		int n=nn;
//		
//		int ans=0;
//	   for(int i=1;i*i<=n;i++)
//	   {
//		   if(n%i==0)
//		   {
//			   if(check(i,n)) ans++;
//			   
//			   
//			   if(i*i!=n&&check(i,n/i))
//			   {
//				   ans++;
//			   }
//		   }
//	   }
//	    
//	   pw.print(ans);
		
		
		
	    
	    int n=sc.nextInt();
	    String s[]=new String[n];
	    
	    for(int i=0;i<n;i++)
	    {
	    	s[i]=sc.next();
	    }
	   int ans=0;
	   int mx=0;
	    for(int i=0;i<n;i++)
	    {
	    	ans=1;
	    	for(int j=0;j<n;j++)
	    	{
	    		if(i!=j)
	    	 {
	    		
	    			if(s[i].equals(s[j]))
	    				ans++;
	    		
	    	 }
	    	}
	    	mx=Math.max(mx, ans);
	    }
	    
	    pw.print(mx);
	    
	    
	    
	    
	    
	    
	//	}
	
 }

	 
	 
	
 
		
			

		
         

			
			
    	
			
	 
	
		
	public static int fun(int x)
	{
		
	int lod=0;
		  while(x!=0)
		  {
			  x/=10;
			  lod++;
			  
		  }
		  return lod;
	}
 public static String funs(int n)
 {
	 String s="1";
	 while(n-->1)
	 {
		 s+="0";
	 }
	 return s;
 }




	static class Pair1 {
		long a;
		long b;

		Pair1(long a, long b) {
			this.a = a;
			this.b = b;
		}
	}

	static class Pair implements Comparable<Pair> {
		int a;
		int b;

		Pair(int a, int b) {
			this.a = a;
			this.b = b;
		}

		public int compareTo(Pair p) {
			if (a != p.a)
				return p.a - a;
			return b - p.b;
		}
	}

	static boolean isPrime(int n) {
		if (n <= 1)
			return false;
		if (n <= 3)
			return true;
		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;
	}

	static long gcd(long a, long b) {
		if (b == 0)
			return a;
		return gcd(b, a % b);
	}

	static int _gcd(int a, int b) {
		if (b == 0)
			return a;
		return _gcd(b, a % b);
	}

	static long fast_pow(long base, long n, long M) {
		if (n == 0)
			return 1;
		if (n == 1)
			return base % M;
		long halfn = fast_pow(base, n / 2, M);
		if (n % 2 == 0)
			return (halfn * halfn) % M;
		else
			return (((halfn * halfn) % M) * base) % M;
	}

	static long modInverse(long n, long M) {
		return fast_pow(n, M - 2, M);
	}

	public static int LowerBound(int a[], int x) {
		int l = -1, r = a.length;
		while (l + 1 < r) {
			int m = (l + r) >>> 1;
			if (a[m] >= x)
				r = m;
			else
				l = m;
		}
		return r;
	}

	public static int UpperBound(int a[], int x) {
		int l = -1, r = a.length;
		while (l + 1 < r) {
			int m = (l + r) >>> 1;
			if (a[m] <= x)
				l = m;
			else
				r = m;
		}
		return l + 1;
	}
	

	static class InputReader {
		public BufferedReader reader;
		public StringTokenizer tokenizer;

		public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		}

		public String nextLine() {
			return null;
		}

		public String next() {
			while (tokenizer == null || !tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		}

		public int nextInt() {
			return Integer.parseInt(next());
		}

		public long nextLong() {
			return Long.parseLong(next());
		}
	}
}
