using System;

static class Program{
    static void Main(){
        new Magatro().Solve();
    }
}

class Magatro{
    public void Solve(){
        string[]line = Console.ReadLine().Split(' ');
        double M = double.Parse(line[0]);
        int N = int.Parse(line[1]);
        for(int i = 0;i<N;i++){
            double one = M+1;
            double two = M*2;
            double three = 0;
            M = (one+two+three)/3;
        }
        Console.WriteLine(M);
    }
}