
import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
      String[] nyu=sc.nextLine().split(" ");
   //  String nyu=sc.nextLine();


int num=Integer.parseInt(nyu[0]);
int numnext=Integer.parseInt(nyu[1]);
int numend=Integer.parseInt(nyu[2]);

//numend-(num-numnext)

//int num2=Integer.parseInt(sn[1]);

int count=0;

if(numend-(num-numnext)<0){
count=0;
}else{
count=numend-(num-numnext);
}



System.out.println(count);

//System.out.println(a/b);


	}
}
/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