#include <iostream>
#include <string>
#include <iomanip>
using namespace std;
int main(){
    string type;
    int discount;
    float month;
    cin>>type>>discount>>month;
    if((type!="Baic"&&type!="Standard"&&type!="Premium")||(discount<0||discount>1||month<=0||month>10)){
          cout<<"Invalid input";
          return;
    }
    else{
        float cost=0;
        if(type=="Basic")cost=30;
        else if(type=="Standard")cost=50;
        else if(type=="Premium")cost=80;
        float total=cost*month;
        if(discount==1)total*=0.8;
        cout<<fixed<<setprecision(2)<<total;
    }
    return 0;
}