using System;
using System.Linq;

class Program {
    static void Main() {
        var N = int.Parse(Console.ReadLine());
        var nums = Console.ReadLine().Split(' ').Select(n => int.Parse(n)).ToArray();

        var minNum = nums.Min();
        var numCount = Enumerable.Range(minNum, N - minNum)
                                 .Count(n => nums.Any(a => n % a == 0));

        Console.WriteLine(numCount);
    }
}