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#include <bits/stdc++.h>
using namespace std;

struct Date{
    int day;
    int h;
    int m;

    void addHour(){
        h++;

        if(h == 24){
            h = 0;
            day++;
        }

        if(h == 2 && day == 29){
            h = 3;
        }
    }

    void addMinute(){
        m++;
        if(m == 60){
            m = 0;
            addHour();
        }
    }

    bool operator==(Date d){
        return (day == d.day && h == d.h && m == d.m);
    }

    void coutD(){
        cout << day << " " << h << " " << m << "\n";
    }
};

int timeForTo(Date s, Date e){
    int ans = 0;

    while(!(s == e)){
        ans++;
        s.addMinute();
    }

    return ans;
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int rund;
    Date start;
    cin >> rund >> start.day >> start.h >> start.m;

    Date endR = {rund + 24 + (rund == 5), 0, 0};

    cout << timeForTo(start, endR);
}