import java.util.*;
 
public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String line = sc.nextLine();
        String nums[] = line.split(" ");
        int A = Integer.parseInt(nums[0]);
        int B = Integer.parseInt(nums[1]);
        int C = Integer.parseInt(nums[2]);
        int amount = C - (A - B);
        if (amount < 0) {
          amount = 0;
        }
        System.out.println(amount);
    }
}
/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