#include <bits/stdc++.h>
using namespace std;
typedef signed long long ll;

#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(x,to) for(x=0;x<(to);x++)
#define FORR(x,arr) for(auto& x:arr)
#define FORR2(x,y,arr) for(auto& [x,y]:arr)
#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
template<class T> bool chmax(T &a, const T &b) { if(a<b){a=b;return 1;}return 0;}
template<class T> bool chmin(T &a, const T &b) { if(a>b){a=b;return 1;}return 0;}
//-------------------------------------------------------

int N;
int T[101010];
vector<int> A[101010];
int K[101010];

int ok(int v) {
	vector<int> P,Q;
	
	int i;
	Q.push_back(-1);
	FOR(i,N) {
		int X=0,Y=0;
		FORR(a,A[i]) {
			if(a<v) X++;
			else Y++;
		}
		if(X) P.push_back(Y);
		else Q.push_back(Y);
	}
	multiset<int> R;
	R.insert(1<<30);
	FOR(i,Q.size()-1) R.insert(K[N-1-i]);
	sort(ALL(P));
	sort(ALL(Q));
	
	if(P.empty()||Q.back()>=*R.begin()) return 1;
	for(i=P.size()-1;i>=0;i--) {
		if(P[i]>=min(*R.begin(),K[i])) return 1;
		if(P[i]<=min(*R.begin(),K[i])-2) return 0;
		if(P[i]==*R.begin()-1&&Q.back()>=K[i]) return 1;
		if(P[i]<=*R.begin()-2) continue;
		R.erase(R.begin());
		R.insert(K[i]);
		
		
	}
	return 0;
	
	
}

void solve() {
	int i,j,k,l,r,x,y; string s;
	
	cin>>N;
	FOR(i,N) cin>>K[i];
	FOR(i,N) {
		cin>>T[i];
		A[i].resize(T[i]);
		FORR(t,A[i]) cin>>t;
	}
	
	int ma=0;
	for(i=29;i>=0;i--) if(ok(ma+(1<<i))) ma+=1<<i;
	cout<<ma<<endl;
}


int main(int argc,char** argv){
	string s;int i;
	if(argc==1) ios::sync_with_stdio(false), cin.tie(0);
	FOR(i,argc-1) s+=argv[i+1],s+='\n'; FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
	cout.tie(0); solve(); return 0;
}