MOVED_TO_CPP

from __future__ import print_function
import sys

def f(l):
  m, s, ms = 0, set(), 0
  for x in l:
    if x not in s:
      s.add(x)
      ms = max(x, ms)
    else:
      s.remove(x)
      ms = ...
    if ms > x:
      m = max(m, x)
    else:
      m = max(m, ms)
  return m

n   = int(sys.stdin.readline())
l1  = map(int, sys.stdin.readline().split())
l2  = map(int, sys.stdin.readline().split())
s2  = set(l2)
s   = [ x for x in l1 if x in s2 ]
l1  = [ x for x in l1 if x not in s ]
l2  = [ x for x in l2 if x not in s ]
m   = max(s)
print(max(m, max(f(l1), f(l2))))