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