#include<iostream> using namespace std; int main(){ double a; char b; cin>>b>>a; if(b=='P') printf("%.2lf\n",a*0.7); else if(b=='G') printf("%.2lf\n",a*0.8); else if(b=='S') printf("%.2lf\n",a*0.9); else printf("%.2lf\n",a*0.95); }