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#include <bits/stdc++.h>

using namespace std;

int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(NULL);
    int runda,day,hour,minute;
    int result;

    cin>>runda>>day>>hour>>minute;

    int first_day[6] = {0,23,24,25,26,27};

    if(runda<=4) {
        if(day == first_day[runda]) {
            result = 2880-60*hour-minute;
        } else result = 1440 - 60*hour-minute;
    } else {
        if(day<=28 || (day==29 and hour<=2)) {
            result = 1440*(30-day)-60-60*hour-minute;
        } else result = 1440-180-60*(hour-3)-minute;
    }
    cout<<result<<"\n";
    return 0;
}