#include <bits/stdc++.h>
#define FOR(i,j,k) for(int i=j;i<=k;++i)
#define NFOR(i,j,k) for(int i=j;i>=k;--i)
#define mkp make_pair
#define fst first
#define sec second
#define inl inline
using namespace std;
typedef long long ll;
typedef unsigned int ui;
typedef pair< int,int > pii;
const int N=805,mod=998244353;
inline int read()
{
	int s=0,w=1; char ch=getchar();
	while(ch<'0'||ch>'9') {if(ch=='-') w=-1; ch=getchar();}
	while(ch>='0'&&ch<='9') {s=(s<<1)+(s<<3)+ch-'0',ch=getchar();}
	return s*w;
}
void file()
{
	freopen(".in","r",stdin);
	freopen(".out","w",stdout);
}
void teltim(int x)
{
	clock_t c1=0;
	if(x) c1=clock();
	else cerr<<endl<<clock()-c1<<"ms"<<endl;
}

int n;
vector <int> sto[N];

int main()
{
	//file();
	n=read();
	FOR(i,1,n)
	{
		int k=read();
		if(k==0)
		{
			printf("0");
			return 0;
		}
		FOR(j,1,k) sto[i].push_back(read());
	}
	
	return 0;
}