import sys
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
inf = 2 ** 63 - 1
mod = 998244353

n = ii()

k = [i - 1 for i in li()][::-1]
a = []
for _ in range(n):
	_ = ii()
	a.append(list(sorted(li(), reverse=True) + [-inf]))

def check(x):
	ind = [-1] * n
	s = set(range(n))
	nowkind = 0
	while s:
		nowk = k[nowkind]
		for v in list(s):
			if a[v][min(len(a[v]) - 1, nowk)] >= x:
				return True
		
		mind = -1
		mini = inf
		for v in list(s):
			if a[v][min(len(a[v]) - 1, nowk - 1)] >= x and a[v][min(len(a[v]) - 1, nowk - 1)] < mini:
				mind = v
				mini = a[v][min(len(a[v]) - 1, nowk - 1)]
		if mind == -1:
			return False
		x = mini
		s.discard(mind)
		nowkind += 1
		if nowkind >= len(k) or nowk <= k[nowkind]:
			return False
	return False


ok = 0
ng = 10 ** 9 + 1
while abs(ok - ng) > 1:
	mid = (ok + ng) // 2
	if check(mid):
		ok = mid

	else:
		ng = mid
print(ok)