# UUID: 4f4c8c76-2632-4471-80f2-6f178a971ccc
from array import array

def solvx():
    N = int(input())
    A = array('I', [int(x) for x in input().split()])
    B = array('I', [int(x) for x in input().split()])

    idx = list(range(N))
    idx.sort(key=lambda i: A[i])

    total_second = sum(B)
    ketpercesek = 0

    running_prefix = total_second

    for pos in range(N - 1, -1, -1):
        i = idx[pos]

        running_prefix -= B[i]

        if A[i] > ketpercesek + running_prefix:
            need = A[i] - (ketpercesek + running_prefix)
            if need < B[i]:
                ketpercesek += need
            else:
                ketpercesek += B[i]

    print(ketpercesek + total_second)

solvx()