class Program
    {
        static void Main(string[] args)
        {
            Console.Write("Enter 'n':");
            int n = int.Parse(Console.ReadLine());
            Console.Write("Enter 'a':");
            int a = int.Parse(Console.ReadLine());
            Console.Write("Enter 'b':");
            int b = int.Parse(Console.ReadLine());
            Console.WriteLine("Number of dividers:{0}",num_div(n, a, b));
        }

        public static int num_div (int n,int a,int b)
        {
            int k = 0;

            if(a==0)
            {
                throw new DivideByZeroException();
            }

            for (int i = a; i <= b; i++)
            {
                if (n % i == 0)
                {
                    k++;
                }

            }
            return k;
        }
    }