using System;

public class Calculator

{

    private static int resultStorage = 0;

    public static string Type = "Arithmetic";

    public static int Sum(int num1, int num2)

    {

        return num1 + num2;

    }

}

public class Program

{

    public static void Main(string[]args)

    {

        var result = Calculator.Sum(10, 25);

        Console.WriteLine(result);

        var calcType = Calculator.Type;

        Calculator.Type = "Scientific";

        Console.WriteLine(calcType);

        Console.WriteLine(Calculator.Type);

    }

}