#include <fstream>
using namespace std;
ifstream fin("balanta.in");
ofstream fout("balanta.out");
int n,m,k,rez,L[1050],fr[1050];
int main()
{
    fin >> n >> m;
    for(int i=1; i<=m; i++)
    {
        fin >> k;
        for(int j=1; j<=k*2; j++) fin >> L[j];
        fin >> rez;
        if(rez == 0)
        {
            for(int j=1; j<=k*2; j++) fr[L[j]] = 1;
        }
        else if(rez == 1)
        {
            for(int j=k+1; j<=k*2; j++) fr[L[j]] = 1;
        }
        else
        {
            for(int j=1; j<=k; j++) fr[L[j]] = 1;
        }
    }
    int sol = 0, nr = 0;
    for(int i=1; i<=n; i++)
    {
        if(!fr[i]) sol = i, nr++;
    }
    if(sol && nr == 1) fout << sol << '\n';
    else    fout << "0\n";

    fout.close();
    return 0;
}