import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner my_scanner = new Scanner(System.in);
        int A = my_scanner.nextInt();
        int B = my_scanner.nextInt();
        int C = my_scanner.nextInt();
        int a_empty = A - B;
        int c_remain = C - a_empty;
        if(c_remain < 0) {
          c_remain = 0;
        }
        System.out.print(c_remain);
    }
}

/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