N = int(input())
A = tuple(map(int, input().split()))
B = tuple(map(int, input().split()))
D = sorted(map(int, input().split()))


def isOK(x):
    dp = [[False] * (N + 1) for _ in range(N + 1)]
    dp[0][0] = True
    for a in range(N + 1):
        for b in range(x - a + 1):
            if a == b == 0:
                continue
            if A[a] + B[b] >= D[x - a - b]:
                if (a and dp[a - 1][b]) or (b and dp[a][b - 1]):
                    dp[a][b] = True
                    if a + b == x:
                        return True
    return False


l, r = 0, N + 1
while r - l > 1:
    m = (r + l) // 2
    if isOK(m):
        l = m
    else:
        r = m
print(l)