import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        long A = sc.nextInt();
        long B = sc.nextInt();
        long C = sc.nextInt();
        System.out.println(C - (A - B) >= 0 ? C - (A - B) : 0);
    }
} import java.util.*; util.* java public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        long A = sc.nextInt();
        long B = sc.nextInt();
        long C = sc.nextInt();
        System.out.println(C - (A - B) >= 0 ? C - (A - B) : 0);
    }
} Main public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        long A = sc.nextInt();
        long B = sc.nextInt();
        long C = sc.nextInt();
        System.out.println(C - (A - B) >= 0 ? C - (A - B) : 0);
    } main {
        Scanner sc = new Scanner(System.in);
        long A = sc.nextInt();
        long B = sc.nextInt();
        long C = sc.nextInt();
        System.out.println(C - (A - B) >= 0 ? C - (A - B) : 0);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long A = sc.nextInt(); A sc.nextInt() sc.nextInt sc long B = sc.nextInt(); B sc.nextInt() sc.nextInt sc long C = sc.nextInt(); C sc.nextInt() sc.nextInt sc System.out.println(C - (A - B) >= 0 ? C - (A - B) : 0) System.out.println System.out System System.out C - (A - B) >= 0 ? C - (A - B) : 0 C - (A - B) >= 0 C - (A - B) C (A - B) A B 0 C - (A - B) C (A - B) A B 0 String[] args args public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        long A = sc.nextInt();
        long B = sc.nextInt();
        long C = sc.nextInt();
        System.out.println(C - (A - B) >= 0 ? C - (A - B) : 0);
    }
} public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        long A = sc.nextInt();
        long B = sc.nextInt();
        long C = sc.nextInt();
        System.out.println(C - (A - B) >= 0 ? C - (A - B) : 0);
    }
} Main
import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        long A = sc.nextInt();
        long B = sc.nextInt();
        long C = sc.nextInt();
        System.out.println(C - (A - B) >= 0 ? C - (A - B) : 0);
    }
}
