import java.util.Scanner;

public 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());

        int remain = a - b;
        int ans = c - remain > 0 ? c - remain : 0;
        System.out.println(ans);
    }

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

        int remain = a - b;
        int ans = c - remain > 0 ? c - remain : 0;
        System.out.println(ans);
    }

} 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());

        int remain = a - b;
        int ans = c - remain > 0 ? c - remain : 0;
        System.out.println(ans);
    } 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());

        int remain = a - b;
        int ans = c - remain > 0 ? c - remain : 0;
        System.out.println(ans);
    } 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 int remain = a - b; remain a - b a b int ans = c - remain > 0 ? c - remain : 0; ans c - remain > 0 ? c - remain : 0 c - remain > 0 c - remain c remain 0 c - remain c remain 0 System.out.println(ans) System.out.println System.out System System.out ans String[] args args public 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());

        int remain = a - b;
        int ans = c - remain > 0 ? c - remain : 0;
        System.out.println(ans);
    }

} public 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());

        int remain = a - b;
        int ans = c - remain > 0 ? c - remain : 0;
        System.out.println(ans);
    }

} Main
import java.util.Scanner;

public 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());

        int remain = a - b;
        int ans = c - remain > 0 ? c - remain : 0;
        System.out.println(ans);
    }

}
