using System;
using System.Collections.Generic;
using System.Linq;

namespace _05._Fashion_Boutique
{
    class Program
    {
        static void Main(string[] args)
        {
            var input = Console.ReadLine().Split().Select(int.Parse).ToArray();
            int rackCapacity = int.Parse(Console.ReadLine());
            int rackCounter = 1;

            Stack<int> clothesValues = new Stack<int>(input);

            int currentClothesValue = 0;

            for (int i = 0; i < clothesValues.Count; i++)
            {
                int currentClothValue = clothesValues.Pop();
                if (rackCapacity - (currentClothesValue + currentClothValue) > 0)
                {
                    currentClothesValue += currentClothValue;
                    i--;
                }
                else if (rackCapacity - (currentClothesValue + currentClothValue) == 0)
                {
                    if (clothesValues.Count != 0)
                    {
                        rackCounter++;
                        currentClothesValue = 0;
                        i--;
                    }
                }
                else if (rackCapacity - (currentClothesValue + currentClothValue) < 0)
                {
                    clothesValues.Push(currentClothValue);
                    rackCounter++;
                    currentClothesValue = 0;
                    i--;
                }
            }
            Console.WriteLine(rackCounter);
        }
    }
}