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

dp = [[0] * (N + 1) for _ in range(N + 1)]
for a in range(N + 1):
    cur = N
    for b in range(N + 1):
        while cur and A[a] + B[b] < D[cur - 1]:
            cur -= 1
        dp[a][b] = cur
for a in range(N, -1, -1):
    for b in range(N, -1, -1):
        tmp = max(dp[a + 1][b] if a != N else 0, dp[a][b + 1] if b != N else 0)
        dp[a][b] = min(dp[a][b], tmp + 1)
print(max(dp[0][1], dp[1][0]))