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

class Program
{
    public void Proc()
    {
        Reader.IsDebug = false;
        long maxNum = long.Parse(Reader.ReadLine());
        long[] num = Reader.ReadLine().Split(' ').Select(a=>long.Parse(a)).ToArray();
        long numA = num[0];
        long numB = num[1];
        long numC = num[2];
        
        long numAB = this.LCM(numA, numB);
        long numBC = this.LCM(numB, numC);
        long numAC = this.LCM(numA, numC);
        
        long numABC = this.LCM(numAB, numC);
        
        long valA = maxNum / numA;
        long valB = maxNum / numB;
        long valC = maxNum / numC;
        
        long valAB = maxNum / numAB;
        long valBC = maxNum / numBC;
        long valAC = maxNum / numAC;
        
        long valABC = maxNum / numABC;
        
        long ans = valA + valB + valC - valAB - valBC - valAC + valABC;
        Console.WriteLine(ans);



    }
    
    private long LCM(long a, long b) {
        long num1 = Math.Max(a,b);
        long num2 = Math.Min(a,b);
        while (num1 % num2 > 0)
        {
            long num3 = num1 % num2;
            num1 = num2;
            num2 = num3;
        }
        long ans = (a / num2) * (b / num2) * num2;
        return ans;
        
    }

    public class Reader
    {
        public static bool IsDebug = true;
        private static String PlainInput = @"




83359640
3304 9805 9945


 
";
        private static System.IO.StringReader Sr = null;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (Sr == null)
                {
                    Sr = new System.IO.StringReader(PlainInput.Trim());
                }
                return Sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
    }
    static void Main()
    {
        Program prg = new Program();
        prg.Proc();
    }
}