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// clang-format off
#include<bits/stdc++.h>
using namespace std;
using LL=long long;
#define FOR(i,l,r) for(auto i=(l);i<=(r);++i)
#define REP(i,n) FOR(i,0,(n)-1)
#define ssize(x) int(x.size())
auto operator<<(ostream&o,auto p)->decltype(p.first,o){return o<<"("<<p.first<<", "<<p.second<<")";}
auto operator<<(ostream&o,auto x)->decltype(x.end(),o){o<<"{";int i=0;for(auto e:x)o<<(", ")+2*!i++<<e;return o<<"}";}
#ifdef DEBUG
#define debug(x...) cerr<<"["#x"]: ",[](auto...$){((cerr<<$<<"; "),...);}(x),cerr<<'\n'
#else
#define debug(...) {}
#endif
// clang-format on

int
date_to_mins(int day, int hour, int min)
{
    return (day * 24 + hour) * 60 + min;
}

int
main()
{
    cin.tie(0)->sync_with_stdio(0);
    int round, day, hour, minute;
    cin >> round >> day >> hour >> minute;
    round -= 1;  // round 0..4

    int deadlines[5]
      = { date_to_mins(25, 0, 0),
          date_to_mins(26, 0, 0),
          date_to_mins(27, 0, 0),
          date_to_mins(28, 0, 0),
          date_to_mins(30, 0, 0),
    };
    int mins = date_to_mins(day, hour, minute);
    int left = deadlines[round] - mins;

    int time_change = date_to_mins(29, 2, 0);
    if (mins <= time_change && deadlines[round] > time_change) left -= 60;

    cout << left << "\n";
    return 0;
}