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

class TEST{
	static void Main(){
		Sol mySol =new Sol();
		mySol.Solve();
	}
}

class Sol{
	public void Solve(){
		long ans=0;
		ans+=N/A;
		ans+=N/B;
		ans+=N/C;
		ans-=N/(A*B);
		ans-=N/(B*C);
		ans-=N/(C*A);
		ans+=N/(A*B*C);
		Console.WriteLine(ans);
		
		
		
	}
	long N,A,B,C;
	public Sol(){
		N=rl();
		var d=rla();
		A=d[0];B=d[1];C=d[2];
	}




	static String rs(){return Console.ReadLine();}
	static int ri(){return int.Parse(Console.ReadLine());}
	static long rl(){return long.Parse(Console.ReadLine());}
	static double rd(){return double.Parse(Console.ReadLine());}
	static String[] rsa(){return Console.ReadLine().Split(' ');}
	static int[] ria(){return Array.ConvertAll(Console.ReadLine().Split(' '),e=>int.Parse(e));}
	static long[] rla(){return Array.ConvertAll(Console.ReadLine().Split(' '),e=>long.Parse(e));}
	static double[] rda(){return Array.ConvertAll(Console.ReadLine().Split(' '),e=>double.Parse(e));}
}