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#include <iostream>

using namespace std;

int main()
{
    int n;
    cin >> n;
    int rs = 1;
    int stt = 0;
    for (int i = 0; i < n; i++)
    {
        int ri;
        cin >> ri;
        if (ri == 0)
        {
            rs++;
        }
        else
        {
            int li;
            for (int j = 0; j < ri; j++)
            {
                cin >> li;
                stt += (li-j-1);
            }
        }
    }
    rs += stt + 1;
    cout << rs/6;
    return 0;
}