import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int in = sc.nextInt() - sc.nextInt();
		int ans = sc.nextInt() - in;
		if(ans > 0)System.out.println(ans);
		else System.out.println(0);
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int in = sc.nextInt() - sc.nextInt();
		int ans = sc.nextInt() - in;
		if(ans > 0)System.out.println(ans);
		else System.out.println(0);
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int in = sc.nextInt() - sc.nextInt();
		int ans = sc.nextInt() - in;
		if(ans > 0)System.out.println(ans);
		else System.out.println(0);
	} main {
		Scanner sc = new Scanner(System.in);
		int in = sc.nextInt() - sc.nextInt();
		int ans = sc.nextInt() - in;
		if(ans > 0)System.out.println(ans);
		else System.out.println(0);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int in = sc.nextInt() - sc.nextInt(); in sc.nextInt() - sc.nextInt() sc.nextInt() sc.nextInt sc sc.nextInt() sc.nextInt sc int ans = sc.nextInt() - in; ans sc.nextInt() - in sc.nextInt() sc.nextInt sc in if(ans > 0)System.out.println(ans);
		else System.out.println(0); ans > 0 ans 0 System.out.println(ans) System.out.println System.out System System.out ans System.out.println(0) System.out.println System.out System System.out 0 String[] args args public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int in = sc.nextInt() - sc.nextInt();
		int ans = sc.nextInt() - in;
		if(ans > 0)System.out.println(ans);
		else System.out.println(0);
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int in = sc.nextInt() - sc.nextInt();
		int ans = sc.nextInt() - in;
		if(ans > 0)System.out.println(ans);
		else System.out.println(0);
	}
} Main
import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int in = sc.nextInt() - sc.nextInt();
		int ans = sc.nextInt() - in;
		if(ans > 0)System.out.println(ans);
		else System.out.println(0);
	}
}