
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();
		if (C-(A-B) < 0) {
			System.out.println(0);
		} else {
			System.out.println(C-(A-B));
		}
	}
}

 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();
		if (C-(A-B) < 0) {
			System.out.println(0);
		} else {
			System.out.println(C-(A-B));
		}
	}
} 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();
		if (C-(A-B) < 0) {
			System.out.println(0);
		} else {
			System.out.println(C-(A-B));
		}
	} main {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		int C = sc.nextInt();
		if (C-(A-B) < 0) {
			System.out.println(0);
		} else {
			System.out.println(C-(A-B));
		}
	} 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 if (C-(A-B) < 0) {
			System.out.println(0);
		} else {
			System.out.println(C-(A-B));
		} C-(A-B) < 0 C-(A-B) C (A-B) A B 0 {
			System.out.println(0);
		} System.out.println(0) System.out.println System.out System System.out 0 {
			System.out.println(C-(A-B));
		} System.out.println(C-(A-B)) System.out.println System.out System System.out C-(A-B) C (A-B) A B 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();
		if (C-(A-B) < 0) {
			System.out.println(0);
		} else {
			System.out.println(C-(A-B));
		}
	}
} 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();
		if (C-(A-B) < 0) {
			System.out.println(0);
		} else {
			System.out.println(C-(A-B));
		}
	}
} 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();
		if (C-(A-B) < 0) {
			System.out.println(0);
		} else {
			System.out.println(C-(A-B));
		}
	}
}


