using static System.Math;
using System;

public class Hello
{
    static void Main()
    {
        var n = int.Parse(Console.ReadLine().Trim());
        var r = double.Parse(Console.ReadLine().Trim());
        getAns(n, r);
    }
    static void getAns(int n, double r)
    {
        var ans = (1d - Pow(1-r, n)) / r * 100d;
        Console.WriteLine(ans);
    }
}