2016_March_26 Vegetable Market

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace VegetableMarket
{
    class Program
    {
        static void Main(string[] args)
        {
            var n = double.Parse(Console.ReadLine());
            var m = double.Parse(Console.ReadLine());

            var nkg = double.Parse(Console.ReadLine());
            var mkg = double.Parse(Console.ReadLine());

            var total = (n * nkg + m * mkg) / 1.94;

            Console.WriteLine("{0}", total);
        }
    }
}