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

void solve() {
    int x, d, h, m; cin >> x >> d >> h >> m;
    int wyn = 0;
    if(x == 1 && d == 23) {
        wyn = 24 * 60;
        wyn += ((24 - h - 1) * 60);
        wyn += (60 - m);
    } else if(x == 1) {
        wyn = ((24 - h - 1) * 60);
        wyn += (60 - m);
    }
    if(x == 2 && d == 24) {
        wyn = 24 * 60;
        wyn += ((24 - h - 1) * 60);
        wyn += (60 - m);
    } else if(x == 2) {
        wyn = ((24 - h - 1) * 60);
        wyn += (60 - m);
    }
    if(x == 3 && d == 25) {
        wyn = 24 * 60;
        wyn += ((24 - h - 1) * 60);
        wyn += (60 - m);
    } else if(x == 3) {
        wyn = ((24 - h - 1) * 60);
        wyn += (60 - m);
    }
    if(x == 4 && d == 26) {
        wyn = 24 * 60;
        wyn += ((24 - h - 1) * 60);
        wyn += (60 - m);
    } else if(x == 4) {
        wyn = ((24 - h - 1) * 60);
        wyn += (60 - m);
    }
    if(x == 5 && d == 27) {
        wyn = 47 * 60;
        wyn += ((24 - h - 1) * 60);
        wyn += (60 - m);
    } else if(x == 5 && d == 28) {
        wyn = 23 * 60;
        wyn += ((24 - h - 1) * 60);
        wyn += (60 - m);
    } else if(x == 5 && h >= 3) {
        wyn = ((24 - h - 1) * 60);
        wyn += (60 - m);
    } else if(x == 5 && h < 2) {
        wyn = ((24 - h - 1) * 60);
        wyn += (60 - m);
        wyn -= 60;
    }
    cout << wyn;
}

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    solve();
    return 0;
}