#include <bits/stdc++.h>

using namespace std;



int main(int argc, char *argv[]) {
    string inName = "test.in";
    string outName = "test.out";
    
    if (argc > 1) {
        inName = argv[1];
        cout << "Using \"" << inName << "\" for test name" << endl;
    } else {
        cout << "Warning: no in name provided, defaulting to test.in" << endl;
    }

    if (argc > 2) {
        outName = argv[2];
        cout << "Using \"" << outName << "\" for out name" << endl;
    } else {
        cout << "Warning: no out name proviced, defaulting to test.out" << endl;
    }

    ifstream in(inName);
    ofstream out(outName);

    // ***************** SOLUTION START HERE *****************
    
    int m, n;
    in >> n;
    in >> m;
    
    string accessStrings[m];
    // set to ""
    for (int i = 0; i < m; i++) {
        accessStrings[i] = "";
    }

    int canAccessCounter;
    int userID;
    for (int i = 0; i < n; i++) {
        in >> canAccessCounter;
        for (int j = 0; j < canAccessCounter; j++) {
            in >> userID;
            accessStrings[userID - 1] += to_string(i);
        }
    }

    unordered_set<string> group_permissions;
    for (int i = 0; i < m; i++) {
        group_permissions.insert(accessStrings[i]);
    }
    out << group_permissions.size() << endl;

    return 0;
}