**#include <bits/stdc++.h> using namespace std; int main() {

int a,s,y,x,d;
double f;
cin>>x>>y;
a=x*87;
s=y*85;
d=a+s;
f=d/(x+y*1.0);
cout<<fixed<<setprecision(4)<<f;

















return 0;

}**