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// Karol Kosinski 2026
#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i=(a),_b=(b);i<_b;++i)
#define FR_(i,a,b) for(int i=(a),_b=(b);i<=_b;++i)
#define FD_(i,b,a) for(int i=(b),_a=(a);i>=_a;--i)
#define ALL(c) (c).begin(),(c).end()
#define SIZE(c) int((c).size())
#define X first
#define Y second
#define endl '\n'
#define NAM(x) #x,'=',x
using namespace std;
using LL = long long;
using ULL = unsigned long long;
using PII = pair<int, int>;
using TIII = tuple<int, int, int>;
template<class...T> void _cout(T...a){(cout<<...<<a);}

#ifndef ENABLE_DEBUG
#define DEB(k,p,f,x...)
#else
#define DEB(k,p,f,x...) {if(k)_cout("------",setw(4),__LINE__," : ",__FUNCTION__,endl);if(p)f(x);}
#endif
#define DEBF(f,x...)    DEB(1,1,f,x)
#define DEBL            DEBF(void,0)
#define DEBC(p,x...)    DEB(0,p,_cout,x)
#define DEBUG(x...)     DEBC(1,x)

constexpr int DAY = 24 * 60;

void solve()
{
    int x, d, h, m, res = 0;
    cin >> x >> d >> h >> m;
    if ( x <= 4 )
    {
        if ( d - x == 22 ) res += DAY;
        res += DAY - h * 60 - m;
    }
    else
    {
        if ( d - x == 22 ) res += 2 * DAY - 60;
        else if ( d - x == 23 ) res += DAY - 60;
        else if ( h < 2 ) res -= 60;
        res += DAY - h * 60 - m;
    }
    cout << res << endl;
}

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