#include<iostream>
#include<iomanip>
using namespace std;
int main(){
    string a;
    int b;
    float c;
    cin>>a;
    cin>>b;
    cin>>c;
    if (a <0 || b<0 || c<0){
        cout<<"Invalid input";
    }
    else{
    if ( a == "Basic"){
        if( b == '0'){
            cout<<fixed<<setprecision(2)<<30*c;
        }
        else if( b== '1'){
            cout<<fixed<<setprecision(2)<<(30*c)-(30*c*0.2);
        }
        else {
            cout<<"Invalid input";
        }
    }
    if ( a == "Standard"){
        if( b == '0'){
            cout<<fixed<<setprecision(2)<<50*c;
        }
        else if( b== '1'){
            cout<<fixed<<setprecision(2)<<(50*c)-(50*c*0.2);
        }
        else {
            cout<<"Invalid input";
        }
    }
    if ( a == "Premium"){
        if( b == '0'){
            cout<<fixed<<setprecision(2)<<80*c;
        }
        else if( b== '1'){
            cout<<fixed<<setprecision(2)<<(80*c)-(80*c*0.2);
        }
        else {
            cout<<"Invalid input";
        }
    }}
    return 0;
}