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)

dp = [[0] * (N + 1) for _ in range(N + 1)]
def check(m):
    dp[0][0] = 1
    for i in range(N + 1):
        for j in range(N + 1):
            if i + j == 0:
                continue
            if i + j > m:
                break
            flag = 0
            if i:
                flag |= dp[i-1][j]
            if j:
                flag |= dp[i][j-1]
            dp[i][j] = int(flag & (D[i + j + N - 1 - m] <= A[i] + B[j]))

    flag = 0
    for i in range(m + 1):
        flag |= dp[i][m - i]

    for i in range(N + 1):
        for j in range(N + 1):
            if i + j == 0:
                continue
            if i + j > m:
                break
            dp[i][j] = 0
    
    return flag


if check(N):
    print(N)
    exit()

yes = 0
no = N
while no - yes != 1:
    mid = (yes + no)//2
    if check(mid):
        yes = mid
    else:
        no = mid

print(yes)