scalefocusFlourist

using System;

namespace scaleFocus
{

    using System.Linq;

    public class Program
    {
        public static void Main(string[] args)
        {
            int[] bouquetsNums = Console.ReadLine().Split().Select(int.Parse).ToArray();
            int p = int.Parse(Console.ReadLine());

            int leftover = 0;
            bool finished = false;

            int roses = 0;

            while (!finished)
            {
                foreach (var t in bouquetsNums)
                {
                    leftover++;

                    roses += t;
                }

                roses += p;
                if (leftover >= p)
                {
                    leftover -= p;
                    roses += p;
                }

                finished = leftover == 0;
            }

            Console.WriteLine(roses);
        }
    }
}