PetShop

using System;

namespace _08.PetShop
{
    internal class Program
    {
        static void Main(string[] args)
        {
            int numberOfDogFood = int.Parse(Console.ReadLine());
            int numberOfCatFood = int.Parse(Console.ReadLine());
            double singlePriceForDogFood = 2.50;
            double singlePriceForCatFood = 4;

            double priceForDogFood = numberOfDogFood * singlePriceForDogFood;
            double priceforCatFood = numberOfCatFood * singlePriceForCatFood;

            double sum = priceForDogFood + priceforCatFood;

            Console.WriteLine($"{sum} lv.");
        }
    }
}