#include<bits/stdc++.h> using namespace std; int main(){ double a,s=0; long long b; cin>>a>>b; if(a<=2){ s=s+11; } if(a>2&&a<=10){ s=s+11+1.8*(a-2); } if(a>10){ s=s+11+1.8*8+(a-10)*1.8*1.5; } s=s+b/3; printf("%.1lf",s); return 0;