import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		int C = sc.nextInt();
		sc.close();

		int ans = B + C - A;
		System.out.println(ans >= 0 ? ans : 0);
	}
} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		int C = sc.nextInt();
		sc.close();

		int ans = B + C - A;
		System.out.println(ans >= 0 ? ans : 0);
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		int C = sc.nextInt();
		sc.close();

		int ans = B + C - A;
		System.out.println(ans >= 0 ? ans : 0);
	} main {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		int C = sc.nextInt();
		sc.close();

		int ans = B + C - A;
		System.out.println(ans >= 0 ? ans : 0);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int A = sc.nextInt(); A sc.nextInt() sc.nextInt sc int B = sc.nextInt(); B sc.nextInt() sc.nextInt sc int C = sc.nextInt(); C sc.nextInt() sc.nextInt sc sc.close() sc.close sc int ans = B + C - A; ans B + C - A B + C B C A System.out.println(ans >= 0 ? ans : 0) System.out.println System.out System System.out ans >= 0 ? ans : 0 ans >= 0 ans 0 ans 0 String[] args args public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		int C = sc.nextInt();
		sc.close();

		int ans = B + C - A;
		System.out.println(ans >= 0 ? ans : 0);
	}
} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		int C = sc.nextInt();
		sc.close();

		int ans = B + C - A;
		System.out.println(ans >= 0 ? ans : 0);
	}
} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		int C = sc.nextInt();
		sc.close();

		int ans = B + C - A;
		System.out.println(ans >= 0 ? ans : 0);
	}
}