std::array<std::set<int>, NUM_PLAYERS> player_values;

std::set<int> eigenvalues{};

int n;

int value;

for (int i_player = 0; i_player < NUM_PLAYERS; i_player++) {

std::cin >> n;

for (int i = 0; i < n; i++) {

std::cin >> value;

player_values[i_player].insert(value);

}

}

eigenvalues = player_values[0];

std::set<int> temp_eigenvalues{};

for (int i_player = 1; i_player < NUM_PLAYERS; i_player++) { // i_player = 1 because player 0 is used!

std::set_intersection(

eigenvalues.begin(), eigenvalues.end(),

player_values[i_player].begin(), player_values[i_player].end(),

std::inserter(temp_eigenvalues, temp_eigenvalues.begin())

);

eigenvalues = temp_eigenvalues;

temp_eigenvalues = {};

}

std::cout << eigenvalues.size();

return 0;

}