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#include <bits/stdc++.h>

#define ll long long
#define pi std::pair<int, int>
#define pll std::pair<ll, ll>
#define vi std::vector<int>
#define vll std::vector<ll>
#define vpi std::vector<pi>
#define vpll std::vector<pll>
#define si std::set<int>

void solve() {
    int x, d, h, m;
    std::cin >> x >> d >> h >> m;

    if(x == 5 && (d <= 28 || h <= 2))
        h++;
    
    int min = ((d-23) * 24 + h) * 60 + m;

    std::vector<int> limit{2880, 4320, 5760, 7200, 10080};

    std::cout << limit[x-1] - min << '\n';
}

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

    int t = 1;
    //std::cin >> t;
    while(t--) {
        solve();
    }
}