using System;

​

class Time {

    public int hour;

    public int minute;

}

​

bool IsBefore(Time t1, Time t2) {

    return  t1.hour < t2.hour ||

            t1.hour == t2.hour && t1.minute < t2.minute;

}

​

int Diff(Time t1, Time t2) {

    Time tBefore = t1;

    Time tAfter = t2;

    if (!IsBefore(t1, t2)) {

        tBefore = t2;

        tAfter = t1;

    }

    return 60 * (tAfter.hour - tBefore.hour) + (tAfter.minute - tBefore.minute);

}

​

class Parking {

    public string id;

    public Time enter;

    public Time exit;

} 

​

// 1

​

string First(Parking[] p) {

    int idxMin = 0;

    for (int i = 1; i < p.Length; i++) {

        if (IsBefore(p[i].enter, p[idxMin].enter)) {

            idxMin = i;

        }

    }

    return p[idxMin].id;

}

​

// 2a

​

int Total(Parking p) {

    return Diff(p.enter, p.exit);

}

​

// 2b

​

int SumMoney(Parking[] p) {

    int total = 0;

    foreach (Parking q in p) {

        int qTotal = Total(q);

        if (qTotal > 120) {

            total += qTotal - 120;

        }

    }

    return total;

}