#include <bits/stdc++.h>
using namespace std;
typedef signed long long ll;

#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a, 0, sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
#define SIZE(array) (sizeof(array) / sizeof(array[0]))

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)

long mod = 1000000007L;

auto cmp = [](pair<int, pair<int, long>> const & a, pair<int, pair<int, long>> const & b) {
	return a.second.second < b.second.second;
};

signed main() {
	int n, m;
	cin >> n >> m;
	double t = n;
	REP(i, m) {
		t = double(t * 3 + 1) / 3.0;
	}
	cout << fixed << setprecision(10) << t;
}