using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;

class Magatro
{
    static long N;
    static long a, b, c;
    static void Main()
    {
        N = int.Parse(Console.ReadLine());
        string[] s = Console.ReadLine().Split(' ');
        a = int.Parse(s[0]);
        b = int.Parse(s[1]);
        c = int.Parse(s[2]);
        long cnt = N / a + N / b + N / c;
        cnt += N / LCM(a, b, c);
        cnt -= N / LCM(a, b) + N / LCM(a, c) + N / LCM(b, c);
        Console.WriteLine(cnt);
    }
    static long LCM(long a,long b)
    {
        long r;
        long x = a * b;
        if (a < b)
        {
            long t = a;
            a = b;
            b = t;
        }
        r = a % b;
        while (r > 0)
        {
            a = b;
            b = r;
            r = a % b;
        }
        return x / b;
    }
    static long LCM(long a,long b,long c)
    {
        return LCM(LCM(a, b), c);
    }
}