#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
    string t; int d; float m;
    cin >> t >> d >> m;
    if((d!=0 && d! = 1) || m<0) return cout<<"Invalid input",0;)
    float c=0;
    if(t=="Basic") c=30;
    else  if(t=="Standard") c=50;
      else  if(t=="premium") c=80;
        else  return cout<<"Invalid input",0;
        float total=c*m;
        if(d==1) total*=0.8;
        cout<<fixed<<setprecision(2)<<total;
}