#include <iostream>
#include <string
using namespace std;

int main() {
    cin>>type;
    cin.ignore();

string driver,passenger,route;
double distance

getline(cin,driver);
getline(cin,passenger);
getline(cin,route);
cin>>distance;

if(type == 1)
cout<< distance*1.5<<endl;
else if(type == 2) 
cout<< distance*0.8;
else
cout<<"Invalid input";

return 0;
}