#include <cstdio>

using namespace std;

int M, N;

int main() {
  scanf("%d%d", &M, &N);
  double Kitaichi = (double)M;
  for (int i = 0; i < N; i++) {
    Kitaichi = (Kitaichi * 3 + 1) / 3;
  }
  printf("%.10f\n", Kitaichi);
}