#ifndef _GLIBCXX_NO_ASSERT
#include <cassert>
#endif
#include <cctype>
#include <cerrno>
#include <cfloat>
#include <ciso646>
#include <climits>
#include <clocale>
#include <cmath>
#include <csetjmp>
#include <csignal>
#include <cstdarg>
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>

#if __cplusplus >= 201103L
#include <ccomplex>
#include <cfenv>
#include <cinttypes>
#include <cstdbool>
#include <cstdint>
#include <ctgmath>
#include <cwchar>
#include <cwctype>
#endif

// C++
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>

#if __cplusplus >= 201103L
#include <array>
#include <atomic>
#include <chrono>
#include <condition_variable>
#include <forward_list>
#include <future>
#include <initializer_list>
#include <mutex>
#include <random>
#include <ratio>
#include <regex>
#include <scoped_allocator>
#include <system_error>
#include <thread>
#include <tuple>
#include <typeindex>
#include <type_traits>
#include <unordered_map>
#include <unordered_set>
#endif


using namespace std;
using ll = long long;

const ll MOD = 1000000007;
const ll INF = 1e18;
const double pi = acos(-1);
const int dx4[4] = {1, 0, -1, 0};
const int dy4[4] = {0, 1, 0, -1};
const int dx8[8] = {1,1,0,-1,-1,-1,0,1};
const int dy8[8] = {0,1,1,1,0,-1,-1,-1};


#define rng(i,a,b) for(int i=int(a);i<int(b);i++)
#define rep(i,b) rng(i,0,b)
#define gnr(i,a,b) for(int i=int(b)-1;i>=int(a);i--)
#define per(i,b) gnr(i,0,b)
#define ALL(obj) (obj).begin(), (obj).end()
#define rALL(obj) (obj).rbegin(), (obj).rend()


template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }


int counter(int x){
    if(x==0) return 0;
    return counter(x >> 1) + (x & 1);
}


void solve(){
    
    // remove the bottom 3 lines when you submit this code.
    std::ifstream in("sample.txt");
    std::cin.rdbuf(in.rdbuf());

    cin.tie(0);
    ios::sync_with_stdio(false);
    
    int n; cin >> n;
    vector<vector<pair<int,int>>> A(n);
    rep(i,n){
        int a; cin >> a;
        A[i].resize(a);
        rep(j,a){
            int x,y; cin >> x >> y;
            A[i].push_back(make_pair(x, y));
        }
    }
    
    int ans = -1;
    
    for (int bit = 0; bit < (1<<n); bit++) {
        bool isOK = true;
        
        for (int i = 0; i < n; i++) {
            if(bit & (1<<i)){
                
                for (int j = 0; j < A[i].size(); j++) {
                    int  person   = A[i][j].first-1;
                    bool isHonest = A[i][j].second;
                    if(!(((bit>>person) & 1) == isHonest)) isOK = false;
                }
            }
        }
        
        if(isOK) {
            ans = max(ans,counter(bit));
            //cout << bitset<15>(bit) << endl;
        }
    }
    
    cout << ans << endl;
 
}



signed main() {
    solve();
    return 0;
}



Measured memory_bytes: 256