import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

m = 5 * 10 ** 5 + 10
n = ni()
a = na() 
b = na()

f = [[] for i in range(m)]
for i in range(n):
    f[a[i]].append(b[i] + a[i])
dp = [i for i in range(m)]

for i in range(m-1, 0, -1):
    for j in f[i]:
        if j >= m:
            dp[i] = max(dp[i], j)
        else:
            dp[i] = max(dp[i], dp[j])

print(dp[1])