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#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define int long long
#define mp make_pair
signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int x , d , h , m;
    cin >> x >> d >> h >> m;
    if(x <= 4)
    {
        int ans = 0;
        if(x % 2 == d % 2)
        {
            ans += 1440;
        }
        ans += (24 - h - 1) * 60 + 60 - m;
        cout << ans;
    }
    else
    {
        int ans = 0;
        if(d == 27)
        {
            ans += (24 - h - 1) * 60 + 60 - m;
        }
        if(d < 28)ans += 1440;
        else if(d == 28)ans += (24 - h - 1) * 60 + 60 - m;
        if(d < 29)ans += 1380;
        else if(d == 29)
        {
            ans += (24 - h - 1) * 60 + 60 - m;
            if(h < 2)ans -= 60;
        }
        cout << ans;
    }
    return 0;
}