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

class Program
{
    static void Main()
    {
        int N = int.Parse(Console.ReadLine());
        int[] abc = Console.ReadLine().Split(' ').Select(s => int.Parse(s)).ToArray();

        int ansCnt = 0;
        for (int i = 1; i <= N; i++)
        {
            if (i % abc[0] == 0 || i % abc[1] == 0 || i % abc[2] == 0)
            { ansCnt++; }
        }
        Console.WriteLine(ansCnt);
    }
}