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#include <bits/stdc++.h>

#define rep(a,b,c) for(auto a = (b); a != (c); a++)
#define repD(a,b,c) for(auto a = (b); a != (c); a--)
#define repIn(a, b) for(auto& a : (b))
#define repIn2(a, b, c) for(auto& [a, b] : (c))

constexpr bool dbg = 1;
#define DEBUG if constexpr(dbg)
#define DC DEBUG std::cerr
#define eol std::endl

#define int long long
#define ld long double
#define pb push_back

using namespace std;
#define rg ranges

int32_t main() {
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
    int x, d, h, m;
    cin >> x >> d >> h >> m;
    d -= 23 + x - 1;
    cout << (23 - h + 24 * (1 + (x == 5) - d)) * 60 + 60 - m - 60 * (x == 5 && (d < 2 || h < 2)) << '\n';
    return 0;
}