#include<iostream>
#include<iomanip>
#include<math.h>
#include<vector>
#include<algorithm>
#include<set>
#include<map>
#include<queue>
#include<stack>
#include<string>
#include<complex>
#include<random>
#include<time.h>

#define INF 1000000000ll
#define MOD 1000000007ll
#define EPS 1e-8

#define REP(i, m) for(long long i = 0; i < m; ++i)
#define FOR(i, n, m) for(long long i = n; i < m; ++i)
#define ALL(v) v.begin(), v.end()
#define pb push_back

using namespace std;
typedef long long ll;
typedef pair<ll, ll> P;
typedef long double ld;


int main() {
	ios::sync_with_stdio(false);
	int m,n;
	cin>>m>>n;
	ld res=m;
	REP(i,n) {
		res=(res*2)/(ld)3+(res+1)/(ld)3+0;
	}
	cout<<fixed<<showpoint<<setprecision(13)<<res<<endl;
}