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