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

namespace ConsoleApp6
{
    class Program
    {
        static void Main()
        {
            double a;
            long n;
            double result = 1;
            string input_1 = Console.ReadLine();
            string input_2 = Console.ReadLine();
            if (!double.TryParse(input_1, out a) | !long.TryParse(input_2, out n))
            {
                Console.WriteLine("wrong");
            }
            else
            {
                double pow = a;
                while (n > 0)
                {
                    result = result + a;
                    a *= pow;
                    n -= 1;
                }
                Console.WriteLine($"{result:0.000}");
            }
        }
    }
}