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

struct czas
{
    int d;
    int h;
    int m;
};

int x, d, h, m = 0;
int ile_minut = 0;
int main()
{
    cin >> x >> d >> h >> m;
    czas koniec;
    czas start = {d, h, m};
    if (x == 1)
        koniec = {24, 23, 60};
    if (x == 2)
        koniec = {25, 23, 60};
    if (x == 3)
        koniec = {26, 23, 60};
    if (x == 4)
        koniec = {27, 23, 60};
    if (x == 5)
        koniec = {29, 23, 60};
    czas koniec_org = koniec;
    if (koniec.m >= start.m)
    {
        ile_minut += koniec.m - start.m;
    }
    else if (koniec.m < start.m)
    {
        if (koniec.h > 0)
        {
            ile_minut += (60 + koniec.m) - start.m;
        }
        else if (koniec.d > 0)
        {
            koniec.d--;
            koniec.h += 23;
            koniec.m += 60;
        }
        ile_minut += koniec.m - start.m;
    }

    if (koniec.h >= start.h)
    {
        ile_minut += 60 * (koniec.h - start.h);
    }
    else if (koniec.h < start.h)
    {
        if (koniec.d >= 0)
        {
            ile_minut += (24 + koniec.h) - start.h;
        }
        else
            return -1;
    }
    if (koniec.d >= start.d)
    {
        ile_minut += 1440 * (koniec.d - start.d);
    }
    else
        return -2;
    if (koniec.d == 29 && (start.d != 29 || (start.h <= 2 && start.d == 29)))
    {
            ile_minut -= 60;
    }
    cout << ile_minut;
    return 0;
}