#include<bits/stdc++.h> 
using namespace std;
typedef long long ll;
#define all(x) (x).begin(),(x).end()
template<typename T1,typename T2> bool chmin(T1 &a,T2 b){if(a<=b)return 0; a=b; return 1;}
template<typename T1,typename T2> bool chmax(T1 &a,T2 b){if(a>=b)return 0; a=b; return 1;}
int dx[4]={0,1,0,-1}, dy[4]={1,0,-1,0};
long double eps = 1e-9;
long double pi = acos(-1);


signed main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout << fixed << setprecision(20);

	double h,r;
	cin>>h>>r;
	double ans = 8.245 + 6.807 * h + 7.073 * r;
	cout << ans << endl;
}