using System;

public class Program

{

    public static void Main()

    {

        int depSum = int.Parse(Console.ReadLine());

        int srok = int.Parse(Console.ReadLine());

        float glp = float.Parse(Console.ReadLine());

        float lihva = depSum * (5.7f / 100);

        float lihvamesec = lihva / 12;

        Console.WriteLine(200 + (srok * lihvamesec));

    }

}