08. Pet Shop

using System;

namespace PetShop
{
    class Program
    {
        static void Main(string[] args)
        {
            double dogFoodPrice = 2.50;
            double catFoodPrice = 4.00;

            int dogFoodCount = int.Parse(Console.ReadLine());
            int catFoodCount = int.Parse(Console.ReadLine());

            double totalPrice = dogFoodPrice * dogFoodCount + catFoodPrice * catFoodCount;

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