import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String[] abc = br.readLine().split(" ");
        int a = Integer.parseInt(abc[0]);
        int b = Integer.parseInt(abc[1]);
        int c = Integer.parseInt(abc[2]);
        System.out.println(problem136a(a, b, c));
    }

    private static int problem136a(int a, int b, int c) {
        return Math.max((c - (a - b)), 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