
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();
        int ans = C-(A-B);
        if(ans <0){
            ans = 0;
        }
        System.out.println("" + ans);
    }

} 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();
        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 = sc.nextInt();
        int B = sc.nextInt();
        int C = sc.nextInt();
        int ans = C-(A-B);
        if(ans <0){
            ans = 0;
        }
        System.out.println("" + ans);
    } main {
        Scanner sc = new Scanner(System.in);
        int A = sc.nextInt();
        int B = sc.nextInt();
        int C = sc.nextInt();
        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 = 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 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 "" ans 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();
        int ans = C-(A-B);
        if(ans <0){
            ans = 0;
        }
        System.out.println("" + ans);
    }

} 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();
        int ans = C-(A-B);
        if(ans <0){
            ans = 0;
        }
        System.out.println("" + ans);
    }

} 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();
        int ans = C-(A-B);
        if(ans <0){
            ans = 0;
        }
        System.out.println("" + ans);
    }

}