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

namespace yukicoder
{
	public class Program
	{
		public static void Main()
		{
			var n = int.Parse(Console.ReadLine());
			var a = Console.ReadLine().Split(' ').Select(value => long.Parse(value)).ToArray();
			if (a[1] % a[0] == 0 && a[2] % a[0] == 0)
			{
				Console.WriteLine(n / a[0]);
			}
			else if (a[1] % a[0] == 0)
			{
				Console.WriteLine(n / a[0] + n / a[2] - n / Lcm(a[0] , a[2]));
			}
			else if (a[2] % a[0] == 0 || a[2] % a[1] == 0)
            {
				Console.WriteLine(n / a[0] + n / a[1] - n / Lcm(a[0] , a[1]));
			}
            else
            {
				Console.WriteLine(n / a[0] + n / a[1] + n / a[2] - n / Lcm(a[0] , a[1]) - n / Lcm(a[1] , a[2]) - n / Lcm(a[0] , a[2]) + n / Lcm(a[0] , Lcm(a[1] , a[2])));
			}
		}
		public static long Lcm(long a, long b)
		{
			return a * b / Gcd(a, b);
		}

		// ユークリッドの互除法 
		public static long Gcd(long a, long b)
		{
			if (a < b)
				// 引数を入替えて自分を呼び出す
				return Gcd(b, a);
			while (b != 0)
			{
				var remainder = a % b;
				a = b;
				b = remainder;
			}
			return a;
		}
	}
}