#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <math.h>
#include <cmath>
#include <limits.h>
#include <map>
#include <set>
#include <queue>
#include <algorithm>
#include <functional>
#include <stdio.h>
using namespace std;

long long MOD = 1000000007;

int main() {
    int N,M;
    cin >> M >> N;
    double a = M;
    for ( int i = 0; i < N; i++ ) {
        a = (a+1)/3 + (a*2)/3;
    }
    printf("%.9f",a);
    return 0;
}