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

public class Program
{
    public static void Main() {
        int N = int.Parse(Console.ReadLine());

        var s = Console.ReadLine().Split(' ');
        int a = int.Parse(s[0]);
        int b = int.Parse(s[1]);
        int c = int.Parse(s[2]);

        long ab = Lcm(a, b);
        long bc = Lcm(b, c);
        long ca = Lcm(c, a);
        long abc = Lcm(Lcm(a, b), c);

        int count = (int)(N / a + N / b + N / c - N / ab - N / bc - N / ca + N / abc);

        Console.WriteLine(count);
    }

    public static long Lcm(long a, long b) {
        return a * b / Gcd(a, b);
    }

    public static long Gcd(long a, long b) {
        if (a < b)
            return Gcd(b, a);
        while (b != 0) {
            var remainder = a % b;
            a = b;
            b = remainder;
        }
        return a;
    }
}