#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
using namespace std;
int main()
{
    int k;
    cin >> k;
    vector <int> num;
    vector <int> str;
    vector <int> count;
    vector <int> help;
    int n;
    string d;
    for (int i = 0; i < k; ++i) {
        cin >> n;
        for (int j = 0; j < n; ++j) {
            cin >> d;
            strings.push_back(d);
        }
    }

    for (int i = 0; i < k; ++i) {
        n = num[i];
        for (int j = 1; j < n; ++j) {
            if (strings[i] == '0') {
                help[i] == i;
                break;
            }
        }
    }
    int o;
    for (int i = 0; i < k; ++i) {
        n = num[i];
        o = help[i];
        for (int j = 1; j + o < n; ++j) {
            if (strings[i] == 0) {
                help[i] == i;
                break;
            }
        }
    }