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

public class yukicoder
{

	public static bool isMultiple(int n, int a, int b, int c)
	{
		if(n % a == 0)
			return true;
		else if(n % b == 0)
			return true;
		else if(n % c == 0)
			return true;
		else
			return false;
	}
	
    public static void Main()
    {
		int n = int.Parse(Console.ReadLine());
		int[] array = Console.ReadLine().Split(' ').Select(x => int.Parse(x)).ToArray();
		int count = 0;
		
		for(int i = 1; i <= n; i++)
    	{
    		if(isMultiple(i, array[0], array[1], array[2]))
    			count++;
    	}
    	
    	Console.WriteLine(count.ToString());
    }

}