#include <bits/stdc++.h> using namespace std;

int main(){ double sum=6; int x,n; cin >> x >> n; if(x<2){ sum+= n/3; }else if(x>=2 && x<=10){ sum+= (x-2)1.8+n/3; }else{ sum+= 81.8; sum+= (x-10)1.81.5+n/3; } cout << sum; return 0; }