// editor2
#include<iostream>
#include<string>
using namespace std;
int main(){
    cin>>type;
    cin.ignore()
}
string driver_passanger,route;
double distance;

getline(cin,driver);
getline(cin,passanger);
getline(cin,route);
cin<<distance*0.8;
else
cout<<"Invalid input";
return 0;
}