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#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <set>
#include <cmath>
#include <string>
using namespace std;



int main() {
    int x, d, h, m;
    cin >> x >> d >> h >> m;
    int last = x == 5;
    int res = (23 + x + last - d) * 24 * 60;
    res += (23 - h) * 60;
    res += (60 - m);
    if (last && (d < 29 || h < 2)) {
        res -= 60;
    }
    cout << res << endl;
    return 0;
}