#include <bits/stdc++.h>
using namespace std;

double dfs(int m, double money)
{
  return m ? dfs(m - 1, (money * 3 + 1) / 3) : money;
}

int main()
{
  ios::sync_with_stdio(false);
  cin.tie(0);
  int m, n;
  cin >> m >> n;
  cout << fixed << setprecision(8) << dfs(n, m) << "\n";
  return 0;
}