using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace Interview

{

    public static class Calculator

    {

        public static double Add(double x, double y)

        {

            return x + y;

        }

​

        public static double Multiply(double x, double y)

        {

            return x * y;

        }

​

    }

}

​