There are b boys and g girls participating in Olympiad of Metropolises. There will be a board games tournament in the evening and n participants have accepted the invitation. The organizers do not know how many boys and girls are among them.

Organizers are preparing red badges for girls and blue ones for boys.

Vasya prepared n+1 decks of badges. The i-th (where i is from 0 to n, inclusive) deck contains i blue badges and n-i red ones. The total number of badges in any deck is exactly n.

Determine the minimum number of decks among these n+1 that Vasya should take, so that there will be a suitable deck no matter how many girls and boys there will be among the participants of the tournament.

Input

The first line contains an integer b (1 ≤ b ≤ 300), the number of boys. 

The second line contains an integer g (1 ≤ g ≤ 300), the number of girls. 

The third line contains an integer n (1 ≤ n ≤ b + g), the number of the board games tournament participants.

Output

Output the only integer, the minimum number of badge decks that Vasya could take.

Examples

Input


5
6
3


Output


4


Input


5
3
5


Output


4

Note

In the first example, each of 4 decks should be taken: (0 blue, 3 red), (1 blue, 2 red), (2 blue, 1 red), (3 blue, 0 red).

In the second example, 4 decks should be taken: (2 blue, 3 red), (3 blue, 2 red), (4 blue, 1 red), (5 blue, 0 red). Piles (0 blue, 5 red) and (1 blue, 4 red) can not be used.
    import java.io.BufferedWriter;
    	import java.io.IOException;
    	import java.io.InputStream;
    	import java.io.OutputStream;
    	import java.io.OutputStreamWriter;
    	import java.io.PrintWriter;
    	import java.io.Writer;
    	import java.util.Arrays;
    	import java.util.InputMismatchException;
    	import java.util.*;
    	import java.io.*;
    	import java.math.*;
    	public class Main7{
     
    	static class Pair
    		{ 
    			int x;
    			int y;
    			public Pair(int x,int y) 
    			{	 
    				this.x= x; 
    				this.y= y;
    			}	 
				
			@Override
					public int hashCode() 
					{ 
						final int temp = 14; 
						int ans = 1; 
						ans =x*31+y*13; 
						return ans; 
					} 
			  
					// Equal objects must produce the same 
					// hash code as long as they are equal 
				@Override
				public boolean equals(Object o) 
				{ 
					if (this == o) { 
						return true; 
					} 
					if (o == null) { 
						return false; 
					} 
					if (this.getClass() != o.getClass()) { 
						return false; 
					} 
					Pair other = (Pair)o; 
					if (this.x != other.x || this.y!=other.y) { 
						return false; 
					} 
					return true; 
				} 
					
    		} 
    		static class Pair1
    		{
    			String x;
    			int y;
    			int z;
    			
    		}
    		static class Compare
    		{ 
    			/*static void compare(Pair arr[], int n) 
    			{ 
    				// Comparator to sort the pair according to second element 
    				Arrays.sort(arr, new Comparator<Pair>() { 
    					@Override public int compare(Pair p1, Pair p2) 
    					{ 
    						if(p1.start>p2.start)
    						{
    							return 1;
    						}
    						else if(p1.start==p2.start)
    						{
    							return 0;
    						}
    						else
    						{
    							return -1;
    						}
    					} 
    				}); 
    			}
    			*/
    		}
    		
    		
    		public static long pow(long a, long b)
    		{
    			long result=1;
    			while(b>0)
    			{
    				if (b % 2 != 0)
    				{
    					result=(result*a)%998244353;
    					b--;
    				} 
    				a=(a*a)%998244353;
    				b /= 2;
    			}   
    			return result;
    		}
    		public static long fact(long num)
    		{
    					long value=1;
    					int i=0;
    					for(i=2;i<num;i++)
    					{
    						value=((value%mod)*i%mod)%mod;
    					}
    					return value;
    				}
    				public static int gcd(int a, int b)
    				{
    					if (a == 0)
    						return b;
    					return gcd(b%a, a);
    				}
    				
    		/*		public static long lcm(long a,long b)
    				{
    					return a * (b / gcd(a, b));
    				}
    			*/	public static long sum(int h)
    				{
    					return (h*(h+1)/2);
    				}
    				public static void dfs(int parent,boolean[] visited,int[] dp)
    				{
    					ArrayList<Integer> arr=new ArrayList<Integer>();
    					arr=graph.get(parent);
    					visited[parent]=true;
    					for(int i=0;i<arr.size();i++)
    					{
    						int num=(int)arr.get(i);
    						if(visited[num]==false)
    						{
    							dfs(num,visited,dp);
							}
							dp[parent]=Math.max(dp[num]+1,dp[parent]);
    					}
    				}
    			//	static int flag1=0;
    				static int[] dis;
    				static int mod=1000000007;
    				static ArrayList<ArrayList<Integer>> graph;
    				
    				public static void bfs(int num,int size)
    				{
    					boolean[] visited=new boolean[size+1];
    					Queue<Integer> q=new LinkedList<>();
    					q.add(num);
    					visited[num]=true;
						while(!q.isEmpty())
    					{
    						int x=q.poll();
    						ArrayList<Integer> al=graph.get(x);
    						for(int i=0;i<al.size();i++)
    						{
    							int y=al.get(i);
    							if(visited[y]==false)
    							{
    								q.add(y);
									visited[y]=true;
    							}
    						}
    					}
    				}	
    				
    				
    				
    				
    				
    				
    				
    			//	static int[] a;			  
    				public static int[] sort(int[] a)
    				{
    					int n=a.length;
    					ArrayList<Integer> ar=new ArrayList<>();
    					for(int i=0;i<a.length;i++)
    					{
    						ar.add(a[i]);
    					}
    					Collections.sort(ar);
    					for(int i=0;i<n;i++)
    					{
    						a[i]=ar.get(i);
    					}
    					return a;
    				}
					static public void main(String args[])throws IOException
    				{
    		//		    BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
    			/*		boolean[] prime=new boolean[1101];
    					for(int i=2;i*i<=1100;i++)
    					{
    						if(prime[i]==false)
    						{
    							for(int j=2*i;j<=1100;j+=i)
    							{
    								prime[j]=true;
    							}
    						}
    					}*/
						int bb=i();
						int e=i();
						int n=i();
						int[] a=new int[n+1];
						int[] b=new int[n+1];
						for(int i=0;i<=n;i++)
						{
							a[i]=i;
							b[i]=n-i;
						}
						if(n<=bb && n<=e)
						{
							pln((n+1)+"");
						}
						else
						{
							if(n<=bb)
							{
								int count=0;
								for(int i=0;i<=n;i++)
								{
									if(b[i]>e && a[i]!=bb)
									{
										count++;
									}
								}
								int ans=n+1-count;
								pln(ans+"");
							}
							else if(n<=e)
							{
								int count=0;
								for(int i=0;i<=n;i++)
								{
									if(a[i]>bb && b[i]!=e)
									{
										count++;
									}
								}
								int ans=n+1-count;
								pln(ans+"");
							}
							else
							{
								int count=0;
								for(int i=0;i<=n;i++)
								{
									if((a[i]>bb && b[i]!=e) || (a[i]!=bb && b[i]>e))
									{
										count++;
									}
								}
								pln((n+1-count)+"");
							}
						}
					}
    				
    				
    				
    				/**/
    				static InputReader in=new InputReader(System.in);
    					static OutputWriter out=new OutputWriter(System.out);
    					public static long l()
    					{
    						String s=in.String();
    						return Long.parseLong(s);
    					}
    					public static void pln(String value)
    					{
    						System.out.println(value);
    					}
    					public static int i()
    					{
    						return in.Int();
    					}
    					public static String s()
    					{
    						return in.String();
    					}
    		}
    			 
    			 
    			 
    			 
    			 
    			 
    			 
    			 
    			 
    			 
    			 
    			 
    			 
    			 
    			 
    			 
    			 
    			 
    			 
    			 
    			 
    			 
    			class InputReader {
    				 
    				private InputStream stream;
    				private byte[] buf = new byte[1024];
    				private int curChar;
    				private int numChars;
    				private SpaceCharFilter filter;
    			 
    				public InputReader(InputStream stream) {
    					this.stream = stream;
    				}
    			 
    				public int read() {
    					if (numChars== -1)
    						throw new InputMismatchException();
    					if (curChar >= numChars) {
    						curChar = 0;
    						try {
    							numChars = stream.read(buf);
    						} catch (IOException e) {
    							throw new InputMismatchException();
    						}
    						if (numChars <= 0)
    							return -1;
    					}
    					return buf[curChar++];
    				}
    			 
    				public int Int() {
    					int c = read();
    					while (isSpaceChar(c))
    						c = read();
    					int sgn = 1;
    					if (c == '-') {
    						sgn = -1;
    						c = read();
    					}
    					int res = 0;
    					do {
    						if (c < '0' || c > '9')
    							throw new InputMismatchException();
    						res *= 10;
    						res += c - '0';
    						c = read();
    					} while (!isSpaceChar(c));
    					return res * sgn;
    				}
    			 
    				public String String() {
    					int c = read();
    					while (isSpaceChar(c))
    						c = read();
    					StringBuilder res = new StringBuilder();
    					do {
    						res.appendCodePoint(c);
    						c = read();
    					} while (!isSpaceChar(c));
    					return res.toString();
    				}
    			 
    				public boolean isSpaceChar(int c) {
    					if (filter != null)
    						return filter.isSpaceChar(c);
    					return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
    				}
    			 
    				public String next() {
    					return String();
    				}
    			 
    				public interface SpaceCharFilter {
    					public boolean isSpaceChar(int ch);
    				}
    			}
    			 
    			class OutputWriter {
    				private final PrintWriter writer;
    			 
    				public OutputWriter(OutputStream outputStream) {
    					writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
    				}
    			 
    				public OutputWriter(Writer writer) {
    					this.writer = new PrintWriter(writer);
    				}
    			 
    				public void print(Object...objects) {
    					for (int i = 0; i < objects.length; i++) {
    						if (i != 0)
    							writer.print(' ');
    						writer.print(objects[i]);
    					}
    				}
    			 
    				public void printLine(Object...objects) {
    					print(objects);
    					writer.println();
    				}
    			 
    				public void close() {
    					writer.close();
    				}
    			 
    				public void flush() {
    					writer.flush();
    				}
    			 
    				}
    			 
    				class IOUtils {
    			 
    				public static int[] readIntArray(InputReader in, int size) {
    					int[] array = new int[size];
    					for (int i = 0; i < size; i++)
    						array[i] = in.Int();
    					return array;
    				}
    			 
    				} 