import java.util.Scanner;

public class Main {

	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		int C = sc.nextInt();
		int difference = A - B;
		int remaining = C - difference;
		System.out.println(remaining < 0 ? 0 : remaining);
		sc.close();
	}
} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		int C = sc.nextInt();
		int difference = A - B;
		int remaining = C - difference;
		System.out.println(remaining < 0 ? 0 : remaining);
		sc.close();
	}
} Main public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		int C = sc.nextInt();
		int difference = A - B;
		int remaining = C - difference;
		System.out.println(remaining < 0 ? 0 : remaining);
		sc.close();
	} main {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		int C = sc.nextInt();
		int difference = A - B;
		int remaining = C - difference;
		System.out.println(remaining < 0 ? 0 : remaining);
		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 difference = A - B; difference A - B A B int remaining = C - difference; remaining C - difference C difference System.out.println(remaining < 0 ? 0 : remaining) System.out.println System.out System System.out remaining < 0 ? 0 : remaining remaining < 0 remaining 0 0 remaining sc.close() sc.close sc String[] args args public class Main {

	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		int C = sc.nextInt();
		int difference = A - B;
		int remaining = C - difference;
		System.out.println(remaining < 0 ? 0 : remaining);
		sc.close();
	}
} public class Main {

	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		int C = sc.nextInt();
		int difference = A - B;
		int remaining = C - difference;
		System.out.println(remaining < 0 ? 0 : remaining);
		sc.close();
	}
} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		int C = sc.nextInt();
		int difference = A - B;
		int remaining = C - difference;
		System.out.println(remaining < 0 ? 0 : remaining);
		sc.close();
	}
}