n = int(input())
a = list(map(int, input().split()))
b = list(map(int, input().split()))
inf = 10**6
x = [[] for _ in range(inf + 1)]
for i in range(n):
	x[a[i]].append(a[i] + b[i])
ok = [0] * (inf + 1)
ok[1] = 1
ans = 0
for i in range(inf + 1):
	if not ok[i]:
		continue
	ans = i
	for j in x[i]:
		ok[j] = 1
print(ans)