using System;
using System.IO;
using System.Linq;
using System.Text;
using System.Diagnostics;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using Enu = System.Linq.Enumerable;

class Program
{
    static readonly int INF = (int)1e8;
    
    void Solve()
    {
        var Want = reader.IntArray(4);
        int max = Want.Max();
        int ans = int.MaxValue;

        for (int a = 1; a <= max; a++)
            for (int b = 1; b <= max; b++)
                for (int c = 1; c <= max; c++)
                    ans = Math.Min(ans, Count(a, b, c, Want));

        Console.WriteLine(ans);
    }

    private int Count(int a, int b, int c, int[] Want)
    {
        int res = 0;
        foreach (int len in Want)
        {
            int min = INF;
            for (int useA = 0; useA <= len / a; useA++)
                for (int useB = 0; useB <= len / b; useB++)
                {
                    int rem = len - a * useA - b * useB;
                    if (rem >= 0 && rem % c == 0)
                        min = Math.Min(min, useA + useB + rem / c);
                }
            res += min;
        }
        return res;
    }




    Reader reader = new Reader(Console.In);
    static void Main() { new Program().Solve(); }
}

class Reader
{
    private readonly TextReader reader;
    private readonly char[] separator = { ' ' };
    private readonly StringSplitOptions removeOp = StringSplitOptions.RemoveEmptyEntries;
    private string[] A = new string[0];
    private int i;

    public Reader(TextReader r) { reader = r; }
    public bool HasNext() { return Enqueue(); }
    public string String() { return Dequeue(); }
    public int Int() { return int.Parse(Dequeue()); }
    public long Long() { return long.Parse(Dequeue()); }
    public double Double() { return double.Parse(Dequeue()); }
    public int[] IntLine() { var s = Line(); return s == "" ? new int[0] : Array.ConvertAll(Split(s), int.Parse); }
    public int[] IntArray(int N) { return Enu.Range(0, N).Select(i => Int()).ToArray(); }
    public int[][] IntGrid(int H) { return Enu.Range(0, H).Select(i => IntLine()).ToArray(); }
    public string[] StringArray(int N) { return Enu.Range(0, N).Select(i => Line()).ToArray(); }
    public string Line() { return reader.ReadLine().Trim(); }
    private string[] Split(string s) { return s.Split(separator, removeOp); }
    private bool Enqueue()
    {
        if (i < A.Length) return true;
        string line = reader.ReadLine();
        if (line == null) return false;
        if (line == "") return Enqueue();
        A = Split(line);
        i = 0;
        return true;
    }
    private string Dequeue() { Enqueue(); return A[i++]; }
}