

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();

		int answer = 0;
		if (c >= a - b) {
			answer = c - a + b;
		}
		System.out.println(answer);

	}

} 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();

		int answer = 0;
		if (c >= a - b) {
			answer = c - a + b;
		}
		System.out.println(answer);

	}

} 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();

		int answer = 0;
		if (c >= a - b) {
			answer = c - a + b;
		}
		System.out.println(answer);

	} main {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();

		int answer = 0;
		if (c >= a - b) {
			answer = c - a + b;
		}
		System.out.println(answer);

	} 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 int answer = 0; answer 0 if (c >= a - b) {
			answer = c - a + b;
		} c >= a - b c a - b a b {
			answer = c - a + b;
		} answer = c - a + b answer c - a + b c - a c a b System.out.println(answer) System.out.println System.out System System.out answer 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();

		int answer = 0;
		if (c >= a - b) {
			answer = c - a + b;
		}
		System.out.println(answer);

	}

} 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();

		int answer = 0;
		if (c >= a - b) {
			answer = c - a + b;
		}
		System.out.println(answer);

	}

} 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();

		int answer = 0;
		if (c >= a - b) {
			answer = c - a + b;
		}
		System.out.println(answer);

	}

}
