#include<iostream>
using namespace std ;
#include<iomanip>
#include<string>
class bu{
    public :
    float t ;
    void dis(string ft , float l , float r = 90.00){
        if(ft!="petrol" ||ft != "diesel" | l < 0 ){
            cout<<"Invalid input";
        }
        else {
            t = l * r ;
        }
    }
};
class au : public bu{
    public:
    void dis(){
        cout<<fixed<<setprecision(2)<<t;
    }
};
int main(){
    string name ;
    int l;
    getline(cin , name );
    if(!name.empty() && name.back() == '\r')name.pop_back();
    cin>>l;
    bu bbb;
    au aaa;
    bbb.dis();
    bbb.dis();
}