using System;

using System.Numerics;

public class Program

{

    public static TResult Test<TResult>() where TResult : INumber<TResult>

    {

        TResult x = TResult.AdditiveIdentity;

        TResult y = TResult.MultiplicativeIdentity;

        TResult z = x * y;

        TResult z2 = z * TResult.CreateChecked(2);

        return z2;

    }

    public static void Main()

    {

        Console.WriteLine(Test<decimal>());

    }

}