N = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
D = list(map(int, input().split()))
D.sort(reverse=True)

l = -1
r = N
while r - l > 1:
  m = (l + r) // 2
  dp = [[False for j in range(N+1-m)] for i in range(N+1-m)]
  dp[0][0] = True
  for i in range(N-m):
    for j in range(N-m):
      if i + j + m >= N: continue
      if not dp[i][j]: continue
      if A[i+1] + B[j] >= D[i+j+m]:
        dp[i+1][j] = True
      if A[i] + B[j+1] >= D[i+j+m]:
        dp[i][j+1] = True
  ans = 0
  for i in range(N+1-m):
    for j in range(N+1-m):
      if dp[i][j]:
        ans = max(ans, i+j)
  if ans == N - m:
    r = m
  else:
    l = m

print(N - r)