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#include <bits/stdc++.h>
using namespace std;
using i64 = int64_t;
using u64 = uint64_t;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int x, d, h, m;
    cin >> x >> d >> h >> m;

    int ans = (24 * 60) - ((h * 60) + m);

    if ((22 + x) == d || (x == 5 && d == 28)) {
        ans += 24 * 60;
    }

    if (x == 5 && d == 27) {
        ans += 24 * 60;
    }

    if (x == 5 && (d < 29 || (d == 29 && h < 2))) {
        ans -= 60;
    }

    cout << ans << "\n";
}