class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int[] list = Array.ConvertAll(Console.ReadLine().Split(' '), num => int.Parse(num));
            Console.WriteLine(MultipleCount(n,list));
        }

        private static int MultipleCount(int n, int[] list)
        {
            int count = 0;
            for(int i = 1; i <= n; i++)
            {
                if (i % list[0] == 0 || i % list[1] == 0 || i % list[2] == 0)
                {
                    count++;
                }
            }
            return count;
        }

    }