#include <iostream>
#include <stdio.h>
using namespace std;
int main(int argc, char* argv[])
{
	double M;
	int	N;
	cin>>M>>N;
	int i=0;
	for  (i=0;i<N;i++){
		M=(M*2.0)/3.0 + (M+1)/3.0;
	}
	printf("%.12lf\n",M);
	return 0;
}