#include <bits/stdc++.h>
using namespace std;
#define  int long long
int MOD = 1000000007;
signed main() {
	int M, N;
	cin >> M >> N;
	
	double m = M;
	for (int i = 0; i < N; i++) {
		m = (m + 1 + 2 * m) / 3;
	}
	cout << setprecision(20)<< m << endl;
	return 0;
}