#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

#define REP(i,n) for(int i=0;i<n;++i)
#define SORT(name) sort(name.begin(), name.end())
#define ZERO(p) memset(p, 0, sizeof(p))
#define MINUS(p) memset(p, -1, sizeof(p))

#define MOD 1000000007
#define INF 1000000000

double M;
int N;

int main()
{
    cin >> M >> N;

    double ans = M;
    double mul = 1.0;
    double div_source = 1.0;
    REP(i, N) {
        ans = ans * 3 + mul;
        mul *= 3.0;
        div_source /= 3.0;
    }

    //printf("%f %f\n", ans, div_source);
    if(div_source == 0) {
        printf("0\n");
    } else {
        printf("%.10f\n", (double)(ans * div_source));
    }

    return 0;
}