import sys
while True:
try:
size = int(input())
row1 = list(map(int,input().split()))
row2 = list(map(int,input().split()))
except EOFError:
break
max = 0
key = {}
for i in row1:
key[i] = 1
for i in row2:
if i in key:
row1.remove(i)
row2.remove(i)
if i > max:
max = i
if len(row1) > 0:
for i in range(1 + len(row1)//2):
t = min(row1)
indices = [i for i,x in enumerate(row1) if x == t]
if not indices[1] - indices[0] == 1:
row1.remove(t)
row1.remove(t)
if t > max:
max = t
if len(row2) > 0:
for j in range(1 + len(row2)//2):
t = min(row2)
indices = [i for i,x in enumerate(row2) if x == t]
if not indices[1] - indices[0] == 1:
row2.remove(t)
row2.remove(t)
if t > max:
max = t
print (max)
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