
import java.util.*;
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());
        sc.close();
        int ans = c - (a - b);
        if(ans < 0){
            ans = 0;
        }
        System.out.println(ans);
    }
} import java.util.*; util.* java 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());
        sc.close();
        int ans = c - (a - b);
        if(ans < 0){
            ans = 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());
        sc.close();
        int ans = c - (a - b);
        if(ans < 0){
            ans = 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());
        sc.close();
        int ans = c - (a - b);
        if(ans < 0){
            ans = 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 sc.close() sc.close sc int ans = c - (a - b); ans c - (a - b) c (a - b) a b if(ans < 0){
            ans = 0;
        } ans < 0 ans 0 {
            ans = 0;
        } ans = 0 ans 0 System.out.println(ans) System.out.println System.out System System.out ans String[] args args

import java.util.*;
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());
        sc.close();
        int ans = c - (a - b);
        if(ans < 0){
            ans = 0;
        }
        System.out.println(ans);
    }
}
