
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		int a;
		int b;
		int c;
		Scanner sc = new Scanner(System.in);
		a = sc.nextInt();
		b = sc.nextInt();
		c = sc.nextInt();
		sc.close();

		int ret = c - ( a - b );
		if(ret < 0) {
			ret = 0;
		}
		System.out.println(ret);

	}

}

/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