
import java.io.*;
import java.util.*;

public class Main
{
	public static void main(String []args)throws IOException
	{
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		
		String []s=br.readLine().split(" ");
		int a=Integer.parseInt(s[0]);
		int b=Integer.parseInt(s[1]);
		int c=Integer.parseInt(s[2]);
		
		c-=(a-b);
		if(c<0)
			System.out.println(0);
		else
			System.out.println(c);		
	}
}



/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz