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();
		int d=a-b;
		if(c-d>0) System.out.println(c-d);
		else System.out.println("0");

	}

} 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();
		int d=a-b;
		if(c-d>0) System.out.println(c-d);
		else System.out.println("0");

	}

} 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();
		int d=a-b;
		if(c-d>0) System.out.println(c-d);
		else System.out.println("0");

	} main {
		Scanner scan = new Scanner(System.in);
		int a=scan.nextInt();
		int b=scan.nextInt();
		int c=scan.nextInt();
		int d=a-b;
		if(c-d>0) System.out.println(c-d);
		else System.out.println("0");

	} 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 int d=a-b; d a-b a b if(c-d>0) System.out.println(c-d);
		else System.out.println("0"); c-d>0 c-d c d 0 System.out.println(c-d) System.out.println System.out System System.out c-d c d 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 scan = new Scanner(System.in);
		int a=scan.nextInt();
		int b=scan.nextInt();
		int c=scan.nextInt();
		int d=a-b;
		if(c-d>0) System.out.println(c-d);
		else System.out.println("0");

	}

} 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();
		int d=a-b;
		if(c-d>0) System.out.println(c-d);
		else System.out.println("0");

	}

} 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();
		int d=a-b;
		if(c-d>0) System.out.println(c-d);
		else System.out.println("0");

	}

}
