using System;

class SuperFizzBuzz
{
	static public void Main(string[] args)
	{
		long N, a, b, c;
		string[] abc;
		long count = 0;
		N = long.Parse(Console.ReadLine());
		abc = Console.ReadLine().Split(' ');
		a = long.Parse(abc[0]);
		b = long.Parse(abc[1]);
		c = long.Parse(abc[2]);
		long lcm_ab = lcm(a, b);
		long lcm_ac = lcm(a, c);
		long lcm_bc = lcm(b, c);
		long lcm_abc = lcm(lcm_ab, lcm_bc);
		count = N / a + N / b + N / c - N / lcm_ab - N / lcm_ac - N / lcm_bc + N / lcm_abc;
		Console.WriteLine(count);
	}

	static long gcd(long x, long y)
	{
		long t;
		if(x < y)
		{
			t = x;
			x = y;
			y = t;
		}
		if(x % y == 0)
			return y;
		else
			return gcd(y, x % y);
	}

	static long lcm(long x, long y)
	{
		return (x * y) / gcd(x, y);
	}
}