#include <cmath>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <functional>
#include <queue>
#include <iostream>
#include <string.h>
#include <iomanip>
#include <algorithm>
#include <functional>
#include <cstdint>
#include <climits>
#include <unordered_set>
#include <sstream>
#include <stack>

using namespace std;

typedef long long int ll;
typedef pair<int,int> pii;
typedef tuple<ll,ll,ll> t3;

using namespace std;

map<char, set<char>> g;
map<char, int> color;

int main()
{
    int m, n;
    cin >> m >> n;
    double e = m;
    for(int i = 0;i < n;i++)
    {
        double f = e * 2.0 / 3.0;
        double s = (e + 1) / 3.0;
        e = f + s;
    }
    cout << fixed;
    cout << setprecision(15);
    cout << e << endl;
    return 0;
}