Pet_Shop

using System;

namespace Pet_Shop
{
    class Program
    {
        static void Main(string[] args)
        {
            int dogs = int.Parse(Console.ReadLine());
            int lastDogs = int.Parse(Console.ReadLine());

            double sum1 = dogs * 2.50;
            double sum2 = lastDogs * 4;

            double totalSum = sum1 + sum2;
            Console.WriteLine("{0} lv", totalSum);
        }
    }
}