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 result = C-(A-B) >=0 ? C-(A-B) : 0;

		System.out.println(result);
		sc.close();
	}
} 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 result = C-(A-B) >=0 ? C-(A-B) : 0;

		System.out.println(result);
		sc.close();
	}
} 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 result = C-(A-B) >=0 ? C-(A-B) : 0;

		System.out.println(result);
		sc.close();
	} main {
		Scanner sc = new Scanner(System.in);

		int A = sc.nextInt();
		int B = sc.nextInt();
		int C = sc.nextInt();

		int result = C-(A-B) >=0 ? C-(A-B) : 0;

		System.out.println(result);
		sc.close();
	} 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 result = C-(A-B) >=0 ? C-(A-B) : 0; result C-(A-B) >=0 ? C-(A-B) : 0 C-(A-B) >=0 C-(A-B) C (A-B) A B 0 C-(A-B) C (A-B) A B 0 System.out.println(result) System.out.println System.out System System.out result sc.close() sc.close sc 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 result = C-(A-B) >=0 ? C-(A-B) : 0;

		System.out.println(result);
		sc.close();
	}
} 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 result = C-(A-B) >=0 ? C-(A-B) : 0;

		System.out.println(result);
		sc.close();
	}
} 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 result = C-(A-B) >=0 ? C-(A-B) : 0;

		System.out.println(result);
		sc.close();
	}
}
