import java.util.Scanner;

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());

		System.out.println(C-(A-B) > 0 ? C-(A-B) : 0);


	}

} import java.util.Scanner; Scanner java.util 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());

		System.out.println(C-(A-B) > 0 ? C-(A-B) : 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());

		System.out.println(C-(A-B) > 0 ? C-(A-B) : 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());

		System.out.println(C-(A-B) > 0 ? C-(A-B) : 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 System.out.println(C-(A-B) > 0 ? C-(A-B) : 0) System.out.println System.out System System.out 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 String[] args args
import java.util.Scanner;

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());

		System.out.println(C-(A-B) > 0 ? C-(A-B) : 0);


	}

}
