import java.util.Scanner;

public class MathematicOperations {
    private static Scanner in;

    public static void Sum() {
        in = new Scanner(System.in);
        System.out.print("Enter the first No :");
        int x = in.nextInt();
        System.out.print("Enter the secound No :");
        int y = in.nextInt();
        int result = x + y;
        System.out.println(result);
        in.close();
    }

    public static void Sub() {
        in = new Scanner(System.in);
        System.out.print("Enter the first No :");
        int x = in.nextInt();
        System.out.print("Enter the secound No :");
        int y = in.nextInt();
        int result = x - y;
        System.out.println(result);
        in.close();
    }

    public static void Mul() {
        in = new Scanner(System.in);
        System.out.print("Enter the first No :");
        int x = in.nextInt();
        System.out.print("Enter the secound No :");
        int y = in.nextInt();
        int result = x * y;
        System.out.println(result);
        in.close();
    }

    public static void Div() {
        in = new Scanner(System.in);
        System.out.print("Enter the first No :");
        int x = in.nextInt();
        System.out.print("Enter the secound No :");
        int y = in.nextInt();
        if (y == 0)
            System.out.println("Cannot dived by zero");
        else {
            int result = x / y;
            System.out.println(result);
            in.close();
        }
    }
}

import java.util.Scanner;

    public class SelectOperation {
        private static Scanner scn;
        private static int num;

    public SelectOperation() {
        scn = new Scanner(System.in);
        System.out.print("1.Sum : , 2.Sub : , 3.Mul : , 4.Div :");
        num = scn.nextInt();

        switch (num) {
        case 1:
            MathematicOperations.Sum();
            break;
        case 2:
            MathematicOperations.Sub();
            break;
        case 3:
            MathematicOperations.Mul();
            break;
        case 4:
            MathematicOperations.Div();
            break;
        default:
            System.out.println("Invalid Operation");
            break;
        }
        scn.close();
    }
}

public class Main {

        public static void main(String[] args) {
            new SelectOperation();

        }

    }