using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

class Program {
    static void Main(string[] args) {
        //入力
        int N = int.Parse(Console.ReadLine());
        string s = Console.ReadLine();
        int a = int.Parse(s.Split(' ')[0]);
        int b = int.Parse(s.Split(' ')[1]);
        int c = int.Parse(s.Split(' ')[2]);

        //回答となる数値
        int ans = 0;

        int a_num = 0;  //aの倍数の個数
        int b_num = 0;  //bの倍数の個数
        int c_num = 0;  //cの倍数の個数

        int a_b_num = 0;
        int b_c_num = 0;
        int c_a_num = 0;

        int a_b_c_num = 0;

        //検証
        a_num = N / a;
        b_num = N / b;
        c_num = N / c;

        a_b_num = N / LCM(a, b);
        b_c_num = N / LCM(b, c);
        c_a_num = N / LCM(c, a);

        a_b_c_num = N / LCM(LCM(a, b), c);

        ans = a_num + b_num + c_num - (a_b_num + b_c_num + c_a_num) + a_b_c_num;

        //出力
        Console.WriteLine(ans);
    }

    //ユークリッドの互除法
    public static int GCD(int a, int b) {
        if (a < b) {
            return GCD(b, a);
        }

        while (b != 0) {
            int amari = a % b;
            a = b;
            b = amari;
        }
        return a;
    }

    //最小公倍数を求める
    public static int LCM(int a, int b) {
        return a * b / GCD(a, b);
    }
}