import java.util.Random;
import java.util.Scanner;

public class Main {
    public static void main(String[] args){

      Scanner sc = new Scanner(System.in);
        int A = sc.nextInt();
        int B = sc.nextInt();

        int differnce = A-B;

        int C = sc.nextInt();

        if (C > differnce) {
            System.out.println(C-differnce);
        } else {
            System.out.println(0);
        }

    }
} import java.util.Random; Random java.util import java.util.Scanner; Scanner 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 differnce = A-B;

        int C = sc.nextInt();

        if (C > differnce) {
            System.out.println(C-differnce);
        } else {
            System.out.println(0);
        }

    }
} Main public static void main(String[] args){

      Scanner sc = new Scanner(System.in);
        int A = sc.nextInt();
        int B = sc.nextInt();

        int differnce = A-B;

        int C = sc.nextInt();

        if (C > differnce) {
            System.out.println(C-differnce);
        } else {
            System.out.println(0);
        }

    } main {

      Scanner sc = new Scanner(System.in);
        int A = sc.nextInt();
        int B = sc.nextInt();

        int differnce = A-B;

        int C = sc.nextInt();

        if (C > differnce) {
            System.out.println(C-differnce);
        } else {
            System.out.println(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 differnce = A-B; differnce A-B A B int C = sc.nextInt(); C sc.nextInt() sc.nextInt sc if (C > differnce) {
            System.out.println(C-differnce);
        } else {
            System.out.println(0);
        } C > differnce C differnce {
            System.out.println(C-differnce);
        } System.out.println(C-differnce) System.out.println System.out System System.out C-differnce C differnce {
            System.out.println(0);
        } System.out.println(0) System.out.println System.out System System.out 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 differnce = A-B;

        int C = sc.nextInt();

        if (C > differnce) {
            System.out.println(C-differnce);
        } else {
            System.out.println(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 differnce = A-B;

        int C = sc.nextInt();

        if (C > differnce) {
            System.out.println(C-differnce);
        } else {
            System.out.println(0);
        }

    }
} Main
import java.util.Random;
import java.util.Scanner;

public class Main {
    public static void main(String[] args){

      Scanner sc = new Scanner(System.in);
        int A = sc.nextInt();
        int B = sc.nextInt();

        int differnce = A-B;

        int C = sc.nextInt();

        if (C > differnce) {
            System.out.println(C-differnce);
        } else {
            System.out.println(0);
        }

    }
}