#!/usr/bin/env pypy3

n = int(input())
a = list(map(int, input().split()))
b = list(map(int, input().split()))
d = list(map(int, input().split()))

d.sort()

ok = 0
ng = n + 1
while ng - ok > 1:
    m = (ok + ng) // 2
    f = [ True ]
    for i in range(1, m + 1):
        f = [ a[j] + b[i - j] >= d[m - i] and (j < i and f[j] or j > 0 and f[j - 1]) for j in range(i + 1) ]

    if any(f):
        ok = m
    else:
        ng = m

print(ok)