#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<string>
#include<algorithm>
#include<cmath>
#include<queue>
#include<vector>
#include<stack>
#include<iomanip>
using namespace std;

#define REP(i,n) for(int i=0;(i)<(n);(i)++)
#define ll long long



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

	double ans = (double)M;
	REP(i, N) {
		ans += (double)1/3;
	}
	
	cout << fixed << setprecision(12) <<ans << endl;
	return 0;
}