import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        sc.close();
        int vessel1 = a - b;
        int vessel2 = c - vessel1;
        System.out.println(Math.max(vessel2,0));
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        sc.close();
        int vessel1 = a - b;
        int vessel2 = c - vessel1;
        System.out.println(Math.max(vessel2,0));
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        sc.close();
        int vessel1 = a - b;
        int vessel2 = c - vessel1;
        System.out.println(Math.max(vessel2,0));
    } main {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        sc.close();
        int vessel1 = a - b;
        int vessel2 = c - vessel1;
        System.out.println(Math.max(vessel2,0));
    } 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 sc.close() sc.close sc int vessel1 = a - b; vessel1 a - b a b int vessel2 = c - vessel1; vessel2 c - vessel1 c vessel1 System.out.println(Math.max(vessel2,0)) System.out.println System.out System System.out Math.max(vessel2,0) Math.max Math vessel2 0 String[] args args public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        sc.close();
        int vessel1 = a - b;
        int vessel2 = c - vessel1;
        System.out.println(Math.max(vessel2,0));
    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        sc.close();
        int vessel1 = a - b;
        int vessel2 = c - vessel1;
        System.out.println(Math.max(vessel2,0));
    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        sc.close();
        int vessel1 = a - b;
        int vessel2 = c - vessel1;
        System.out.println(Math.max(vessel2,0));
    }
}