using System;

class SuperFizzBuzz
{
	static public void Main(string[] args)
	{
		int N, a, b, c;
		string[] abc;
		int count = 0;
		N = int.Parse(Console.ReadLine());
		abc = Console.ReadLine().Split(' ');
		a = int.Parse(abc[0]);
		b = int.Parse(abc[1]);
		c = int.Parse(abc[2]);

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