sum numbers

import java.util.Scanner;

public class ex3 {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int num1 = Integer.parseInt(scan.nextLine());
        int num2 = Integer.parseInt(scan.nextLine());
        String operation = scan.nextLine();
        double result = 0;
        switch (operation) {
            case "sum":
                result = num1 + num2;
                break;
            case "sub":
                result = Math.abs(num1 - num2);
                break;
            case "mul":
                result = num1 * num2;
                break;
            case "div":
                result = num1*1.0 / num2;
                break;
        }
        System.out.println(result);
    }
}