#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
#define rep(i, n) for(int i = 0; i < n; i++)
#define REP(i, a, b) for(int i = a; i < b; i++)
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define fi first
#define se second
#define debug(x) cerr <<__LINE__<< ": " <<#x<< " = " << x << endl
#define debug_vec(v) cerr<<__LINE__<<": "<<#v<<" = ";rep(i,v.size())cerr<<" "<<v[i];cerr<<endl
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
const int INF = (1<<30) - 1;
const ll LINF = (1LL<<60) - 1;

void solve() {
    int n, ans = 0;
    cin >> n;
    vector<pii> A[n];
    rep(i, n) {
        int a;
        cin >> a;
        rep(j, a) {
            int x, y;
            cin >> x >> y;
            x--;
            A[i].push_back({x, y});
        }
    }
    rep(bit, 1 << n) {
        rep(i, n) {
            if ((bit >> i & 1) == 0) continue;
            rep(j, A[i].size()) {
                int x, y;
                tie(x, y) = A[i][j];
                if ((bit >> x & 1) != y) {
                    goto end;
                }
            }
        }
        chmax(ans, __builtin_popcount(bit));
        end:;
    }
    cout << ans << endl;
}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    solve();
    return 0;
}

#include <bits/stdc++.h>
#define rep(i,a,b) for(int i=a;i<(b);++i)
#define erep(i,a,b) for(int i=a;i<=(int)(b);++i)
#define per(i,a,b) for(int i=(a);i>(b);--i)
#define eper(i,a,b) for(int i=(a);i>=b;--i)
#define pb push_back
#define mp make_pair
#define INF 100100100100
#define MOD 1000000007
#define all(x) (x).begin(),(x).end()
#define vii vector<int>
#define vll vector<long long>
using namespace std;
typedef long long ll;
typedef pair<int,int> Pii;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a = b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a = b; return 1; } return 0; }
int dy[]={0, 0, 1, -1};
int dx[]={1, -1, 0, 0};
ll gcd(ll a,ll b){return b?gcd(b,a%b):a;}
ll lcm(ll a,ll b){return a/gcd(a, b)*b;}

int n;
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
    cin >> n;
    vll a(n);
    rep(i, 0, n) cin >> a[i];
    int k = a[0];
    rep(i, 1, n) k = gcd(k, a[i]);
    vii ans;
    erep(x, 1, k) {
        bool flag = true;
        rep(i, 0, n) {
            if (a[i] % x != 0) flag = false;
        }
        if (flag) {
            ans.pb(x);
        }
    }
    rep(i, 0, ans.size()) cout << ans[i] << endl;
    return 0;
}
