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
rec = True
if rec:
    sys.setrecursionlimit(5 * 10 ** 5)
    from pypyjit import set_param
    set_param('max_unroll_recursion=-1')
 
n = ii()

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

def check(x, s, ix):
    for i in s:
        if len(a[i]) > k[ix] and a[i][k[ix]] >= x:
            return True
        if len(a[i]) - 1 > k[ix] and k[ix] - 1 >= 0 and a[i][k[ix] - 1] >= x and ix + 1 < len(k):
            s.discard(i)
            ix += 1
            p = check(x, s, ix)
            ix -= 1
            s.add(i)
            if p:
                return True 
        if len(a[i]) == k[ix] and a[i][min(len(a[i]) - 1, k[ix])] >= x:
            s.discard(i)
            ix += 1
            p = check(a[i][min(len(a[i]) - 1, k[ix])], s, ix)
            s.add(i)
            ix -= 1
            if p:
                return True
        if len(a[i]) < k[ix] and a[i][min(len(a[i]) - 1, k[ix])] >= x:
            s.discard(i)
            ix += 1
            p = check(x, s, ix)
            s.add(i)
            ix -= 1
            if p:
                return True
    return False


ok = 0
ng = 10 ** 9 + 1

while abs(ok - ng) > 1:
    mid = (ok + ng) // 2
    if check(mid, set(range(n)), 0):
        ok = mid
    else:
        ng = mid
print(ok)