#!/usr/bin/env python3
from sys import exit

n = int(input())
a = sorted(input().split())
b = sorted(input().split())
if len(a) != n: exit(1)
if len(b) + 1 != n: exit(2)
i = 0
while i < len(b) and a[i] == b[i]: i += 1
if i == len(a): exit(3)
while i + 1 < len(a) and a[i + 1] == b[i]: i += 1
if i + 1 != len(a): exit(4)

exit(42)