#include <fstream>
using namespace std;

ifstream fin("balanta.in");
ofstream fout("balanta.out");

int n,m,i,k,r,f[1025],x[1025];

int main(){
    fin>>n>>m;
    for(;m;m--){
        fin>>k;
        for(i=1;i<=2*k;i++)
            fin>>x[i];
        fin>>r;

        if(r==0)
            for(i=1;i<=2*k;i++)
                f[x[i]]=-1;

        if(r==1){

            for(i=1;i<=k;i++){
                if(f[x[i]]==2 || f[x[i]]==-1)
                    f[x[i]]=-1;
                else
                    f[x[i]]=1;
            }

            for(i=k+1;i<=k;i++){
                if(f[x[i]]==1 || f[x[i]]==-1)
                    f[x[i]]=-1;
                else
                    f[x[i]]=2;
            }

        }

        if(r==2){

            for(i=1;i<=k;i++){
                if(f[x[i]]==1 || f[x[i]]==-1)
                    f[x[i]]=-1;
                else
                    f[x[i]]=2;
            }

            for(i=k+1;i<=k;i++){
                if(f[x[i]]==2 || f[x[i]]==-1)
                    f[x[i]]=-1;
                else
                    f[x[i]]=1;
            }

        }
    }

    int sol=0;
    for(i=1;i<=n;i++)
        if(f[i]!=-1 && f[i]!=0){
            if(sol==0)
                sol=i;
            else{
                fout<<0<<"\n";
                return 0;
            }
        }
    fout<<sol;

    return 0;
}