﻿class Calculator {

    int add(int firstNumber, int secondNumber) {
        return firstNumber + secondNumber;
    }

    double add(double firstNumber, double secondNumber) {
        return firstNumber + secondNumber;
    }
}

public class ${CLASS_NAME} {

    public static void main(String[] args) {

        Calculator calculator = new Calculator();

        System.out.println(calculator.add(10, 20));
        System.out.println(calculator.add(10.5, 20.5));
    }
}