def main():
    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
    mid = (ok + ng) // 2
    while ng - ok > 1:
        d = D[:mid]
        seen = [[0 for _ in range(N+1)] for _ in range(N+1)]
        st = [(0, 0)]
        seen[0][0] = 1
        flg = 0
        while st:
            i, j = st.pop()
            if i+1 <= N:
                if seen[i+1][j] == 0:
                    seen[i + 1][j] = 1
                    if A[i+1] + B[j] >= d[-(i+j+1)]:
                        if i+j+1 == mid:
                            flg = 1
                            break
                        st.append((i+1, j))
            if j+1 <= N:
                if seen[i][j+1] == 0:
                    seen[i][j + 1] = 1
                    if A[i] + B[j+1] >= d[-(i+j+1)]:
                        if i+j+1 == mid:
                            flg = 1
                            break
                        st.append((i, j+1))
        if flg:
            ok = mid
        else:
            ng = mid
        mid = (ok+ng)//2

    print(ok)


if __name__ == '__main__':
    main()