using System;

public class Program

{

    public static void Main()

    {

        var previousGrossTimeWeighted = -29887205718381714378482.054865M;

        var grossVariation = -4096526.2010845839874205512028M;

        decimal grossTimeWeighted = ((1 + (previousGrossTimeWeighted)) * (1 + grossVariation)) - 1;

        Console.WriteLine(grossTimeWeighted);

    }

}