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

#ifdef DEBUG
auto &operator<<(auto &o, pair<auto, auto> p) {
    return o << "(" << p.first << ", " << p.second <<")";
}
auto operator<<(auto &o, auto x)-> decltype(x.end(), o) {
    o << "{";int i = 0;
    for(auto e : x) o << ", "+!i++<<e;
    return o <<"}";
}
#define debug(x...) cerr << "["#x"]: ",[](auto...$){((cerr<<$<<"; "),...)<<endl;}(x)
#else
#define debug(...) {}
#endif

#define int long long
#define all(x) x.begin(), x.end()
#define sz(x) (int)(x).size()
#define pb push_back
#define fi first
#define se second
typedef pair <int, int> pii;


void test() {
    debug("TC______________________");
    int r, d, h, m; cin>>r>>d>>h>>m;
    int dl = 23 + r + (r == 5 ? 1 : 0) - d;

    int hl = dl * 24 + 23 - h;
    int ml = hl * 60 + 60 - m;
    
    if (r == 5 && ml >= 22*60) {
        ml -= 60;
    }

    cout<<ml<<'\n';
}

signed main() {
  ios_base::sync_with_stdio(0); cin.tie(0);
  int t = 1; 
  while (t--) {
    test();
  }
}