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]);

        int count = 0;
        for (int i = 1; i <= N; i++) {
            if(i % a == 0 | i % b == 0 || i % c == 0) {
                count++;
            }
        }
        System.Console.WriteLine(count);
    }
}