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{
	static long gcd (long a, long b) {return a == 0 ? b : gcd( b%a,a);}
	static long lcm (long a, long b) { return a * b / gcd (a,b) ;}
	public void Solve(){
		
		long sum = 0;
		long[] ABC= new long[]{ A,B,C };
		sum += ABC.Select(num => N/num).Sum();
		sum -= (new long[]{ lcm(A,B), lcm(B,C), lcm(C,A)}).Select(num => N/num).Sum();
		sum += N / ABC.Aggregate((res,num) => lcm(res,num));
		
		Console.WriteLine(sum);
	}
	long N;
	long 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(char sep=' '){return Console.ReadLine().Split(sep);}
	static int[] ria(char sep=' '){return Array.ConvertAll(Console.ReadLine().Split(sep),e=>int.Parse(e));}
	static long[] rla(char sep=' '){return Array.ConvertAll(Console.ReadLine().Split(sep),e=>long.Parse(e));}
	static double[] rda(char sep=' '){return Array.ConvertAll(Console.ReadLine().Split(sep),e=>double.Parse(e));}
}