
import java.util.Scanner;

public class Main {
    public static void main(String[] args){
        Scanner stdIn=new Scanner(System.in);
        byte a=stdIn.nextByte();
        byte b=stdIn.nextByte();
        byte c=stdIn.nextByte();
        c-=a-b;
        if(c>0){
            System.out.println(c);
        }
        else System.out.println(0);
    }
}
/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