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#include <iostream>

using namespace std;
int x, d, h, m, k;
int main()
{
    cin >> x >> d >> h >> m;
    if (x == 1)
    {
        if(d == 23)
        {
            k = k + 1440;
        }
        k = k + 1440 - h*60 - m;
    }
    if (x == 2)
    {
        if(d == 24)
        {
            k = k + 1440;
        }
        k = k + 1440 - h*60 - m;
    }
    if (x == 3)
    {
        if(d == 25)
        {
            k = k + 1440;
        }
        k = k + 1440 - h*60 - m;
    }
    if (x == 4)
    {
        if(d == 26)
        {
            k = k + 1440;
        }
        k = k + 1440 - h*60 - m;
    }
    if (x == 5)
    {
        if(d == 27)
        {
            k = k + 2*1440;
        }
        if(d == 28)
        {
            k = k + 1440;
        }
        k = k + 1440 - h*60 - m - 60;
        if(d == 29 && h > 2)
        {
            k = k + 60;
        }
    }
    cout << k;
    return 0;
}