#include <bits/stdc++.h>
#define REP(i,n,N) for(int i=(n);i<(int) N;i++)
#define RREP(i,n,N) for(int i=N-1;i>=(int) n;i--)
#define p(s) cout<<(s)<<endl
#define DEBUG(x,y) cout<<#x<<": "<<x<<" , "<<#y<<": "<<y<<endl;
#define CK(n,a,b) ((a)<=(n)&&(n)<(b))
#define F first
#define S second
typedef long long ll;
using namespace std;
const ll mod=1e9+7;


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