import java.util.Scanner;

public class Main {

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

		int rem = C - (A - B);
		if(rem > 0) {
			System.out.println(rem);
		}else {
			System.out.println(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 = Integer.parseInt(sc.next());
		int B = Integer.parseInt(sc.next());
		int C = Integer.parseInt(sc.next());
		sc.close();

		int rem = C - (A - B);
		if(rem > 0) {
			System.out.println(rem);
		}else {
			System.out.println(0);
		}
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A = Integer.parseInt(sc.next());
		int B = Integer.parseInt(sc.next());
		int C = Integer.parseInt(sc.next());
		sc.close();

		int rem = C - (A - B);
		if(rem > 0) {
			System.out.println(rem);
		}else {
			System.out.println(0);
		}
	} main {
		Scanner sc = new Scanner(System.in);
		int A = Integer.parseInt(sc.next());
		int B = Integer.parseInt(sc.next());
		int C = Integer.parseInt(sc.next());
		sc.close();

		int rem = C - (A - B);
		if(rem > 0) {
			System.out.println(rem);
		}else {
			System.out.println(0);
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int A = Integer.parseInt(sc.next()); A Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc int B = Integer.parseInt(sc.next()); B Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc int C = Integer.parseInt(sc.next()); C Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc sc.close() sc.close sc int rem = C - (A - B); rem C - (A - B) C (A - B) A B if(rem > 0) {
			System.out.println(rem);
		}else {
			System.out.println(0);
		} rem > 0 rem 0 {
			System.out.println(rem);
		} System.out.println(rem) System.out.println System.out System System.out rem {
			System.out.println(0);
		} System.out.println(0) System.out.println System.out System System.out 0 String[] args args public class Main {

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

		int rem = C - (A - B);
		if(rem > 0) {
			System.out.println(rem);
		}else {
			System.out.println(0);
		}
	}
} public class Main {

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

		int rem = C - (A - B);
		if(rem > 0) {
			System.out.println(rem);
		}else {
			System.out.println(0);
		}
	}
} Main
import java.util.Scanner;

public class Main {

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

		int rem = C - (A - B);
		if(rem > 0) {
			System.out.println(rem);
		}else {
			System.out.println(0);
		}
	}
}