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

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

    int x, d, h, m;
    cin >> x >> d >> h >> m;
    int res_h = 0, res_m = 0;

    int res = 0; 
    if(x >= 1 && x <= 4) {
        res_h = 23 - h;
        res_m = 60 - m;
        
        if(d == 22 + x) {
            res_h += 24;
        }
        
        res = res_h * 60 + res_m;
    } else {
        res_h = 23 - h + (29 - d) * 24;
        res_m = 60 - m;

        if(d < 29 || (d == 29 && h < 2)) {
            res_h--;
        }

        res = 60 * res_h + res_m;
    }
    cout << res << '\n'; 

    return 0;
}