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

namespace ConsoleApplication3
{
	static class Extensions
	{
		public static IEnumerable<T> Do<T>(this IEnumerable<T> source, Action<T> process)
		{
			foreach (var elem in source)
			{
				process(elem);
				yield return elem;
			}
		}

		public static IEnumerable<T> Repeat<T>(this IEnumerable<T> source, Func<T,bool> condition,
			Action<T> sideEffect)
		{
			foreach (var elem in source)
			{
				while (condition(elem))
				{
					sideEffect(elem);
					yield return elem;
				}
			}
		}
	}

	class Program
	{
		private static readonly List<int> PrimeNumbers = new List<int> {2, 3};

		public static IEnumerable<int> GetPrimeSequence()
			=> PrimeNumbers.Concat(Enumerable.Range((PrimeNumbers.Max() - 1)/2 + 1, 1000000000)
				.Select(x => x*2 + 1)
				.Where(x => PrimeNumbers.TakeWhile(p => Math.Sqrt(x) >= p).All(p => x%p != 0))
				.Do(x => PrimeNumbers.Add(x)));

		public static IEnumerable<int> Factorization(int value)
		{
			var tmp = value;
			return GetPrimeSequence().TakeWhile(_ => tmp != 1).Repeat(x => tmp%x == 0, x => tmp/=x);
		}

		public static int LeastCommonMultiple(int lParam, int rParam)
		{
			var lFact = Factorization(lParam).ToLookup(x => x).Select(x => new {prime = x.Key, value = x.Key*x.Count()});
			var rFact = Factorization(rParam).ToLookup(x => x).Select(x => new {prime = x.Key, value = x.Key*x.Count()});


			var ret = lFact.Concat(rFact).ToLookup(x => x.prime,x=>x.value);
			var hoge = ret.Select(x => x.Max());

			return hoge.Aggregate(1, (accum, i) => accum *= i);
		}

		static void Main(string[] args)
		{
			var n = int.Parse(Console.ReadLine());
			var input = Console.ReadLine().Split(' ').Select(x => int.Parse(x)).ToArray();

			var ab = LeastCommonMultiple(input[0], input[1]);
			var bc = LeastCommonMultiple(input[1], input[2]);
			var ca = LeastCommonMultiple(input[2], input[0]);

			var med = LeastCommonMultiple(ab, input[2]);

			var accum = input.Select(x => n/x).Sum();
			accum -= n/ab;
			accum -= n/bc;
			accum -= n/ca;
			accum += n/med;

			Console.WriteLine(accum);

		}
	}
}