using System;

public class Hello
{
    public static void Main()
    {
        var n = int.Parse(Console.ReadLine().Trim());
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = long.Parse(line[0]);
        var b = long.Parse(line[1]);
        var c = long.Parse(line[2]);
        var ab = getLcm(a, b);
        var bc = getLcm(b, c);
        var ca = getLcm(c, a);
        var abc = getLcm(c, ab);
        var ans = n / a + n / b + n / c - n / ab - n / bc - n / ca + n / abc;
        Console.WriteLine(ans);
    }
    public static long getLcm(long a, long b)
    {
        var ab = a * b;
        if (a < b) return getLcm(b, a);
        while (b != 0)
        {
            var w = a % b;
            a = b;
            b = w;
        }
        return ab / a;
    }
}