#include<iostream>

using namespace std;
int main()
{
    int ridetype;
    string drivername, passangername, route;
    double distance;
    cin >> ridertype;
    cin >> drivertype;
    cin >> passangername;
    cin >> route;
    cin >> distance;
    
    double fare=0;
    
    if(ridetype == 1)
    {
        fare = distance * 1.5
    
    }
    elseif(ridetype == 2){
        fare = distance * 0.8
    }
    else{
        cout<<"Invalid input";
        return 0;
    }
    cout << fixed << setprecision(1) << fare;
    
    return 0;
}