import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int a = scan.nextInt();
		int b = scan.nextInt();
		int c = scan.nextInt();
		scan.close();
		System.out.println((c-(a-b)<0)? "0":c-(a-b));
	}
} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int a = scan.nextInt();
		int b = scan.nextInt();
		int c = scan.nextInt();
		scan.close();
		System.out.println((c-(a-b)<0)? "0":c-(a-b));
	}
} Main public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int a = scan.nextInt();
		int b = scan.nextInt();
		int c = scan.nextInt();
		scan.close();
		System.out.println((c-(a-b)<0)? "0":c-(a-b));
	} main {
		Scanner scan = new Scanner(System.in);
		int a = scan.nextInt();
		int b = scan.nextInt();
		int c = scan.nextInt();
		scan.close();
		System.out.println((c-(a-b)<0)? "0":c-(a-b));
	} Scanner scan = new Scanner(System.in); scan new Scanner(System.in) int a = scan.nextInt(); a scan.nextInt() scan.nextInt scan int b = scan.nextInt(); b scan.nextInt() scan.nextInt scan int c = scan.nextInt(); c scan.nextInt() scan.nextInt scan scan.close() scan.close scan System.out.println((c-(a-b)<0)? "0":c-(a-b)) System.out.println System.out System System.out (c-(a-b)<0)? "0":c-(a-b) (c-(a-b)<0) c-(a-b) c (a-b) a b 0 "0" c-(a-b) c (a-b) a b String[] args args public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int a = scan.nextInt();
		int b = scan.nextInt();
		int c = scan.nextInt();
		scan.close();
		System.out.println((c-(a-b)<0)? "0":c-(a-b));
	}
} public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int a = scan.nextInt();
		int b = scan.nextInt();
		int c = scan.nextInt();
		scan.close();
		System.out.println((c-(a-b)<0)? "0":c-(a-b));
	}
} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int a = scan.nextInt();
		int b = scan.nextInt();
		int c = scan.nextInt();
		scan.close();
		System.out.println((c-(a-b)<0)? "0":c-(a-b));
	}
}