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#include <bits/stdc++.h>
#define nwd(a, b) __gcd(a, b)
#define nww(a, b) (a * b) / (nwd(a, b))
using namespace std;

int n, res = 1, amt, temp;
int main()
{   
    cin.sync_with_stdio(0);
    cin >> n;
    for(int i = 1; i <= n; ++i)
    {
        cin >> amt;
        for(int j = 0; j < amt; ++j)
            cin >> temp;
        if(amt == 0 && i == 1)
        {
            res == -1;
        }
        if(amt != 0 && res != -1) res = nww(res, amt);
    }
    if(res == -1)
        cout << 1;
    else
        cout << res;
}