// editor2
#include<iostream>
#include<string>
using namespace std;
int main(){
    int type;
    cin>>type;
    cin.ignore(1000,'\n');
    string driver,passenger,route;
    double distance;
    getline(cin,driver);
    getline(cin,passenger);
    getlie(cin,route);
    cin>>distance;
    if(type==1)
    cout<<distance*1.5;
    else if(type==2)
    cout<<"distance*1.5";
    else
    cout<<"Invaid input";
    return 0;
}