n = int(input())
a = [int(i) for i in input().split()]
b = [int(i) for i in input().split()]
d = [int(i) for i in input().split()]

d.sort()
n1 = n+1
es = [[] for i in range(n1)]
for i in range(n1):
    for j in range(n1):
        p = i + j
        if p <= n:
            es[p].append(i*n1+j)

m = [0] * (n1*n1)
for p in range(n,0,-1):
    for e in es[p]:
        i = e // n1
        j = e % n1
        s = m[e]
        r = a[i] + b[j]
        if s < n and d[s] <= r:
            s += 1
        u = e - 1
        if u >= 0 and s > m[u]:
            m[u] = s
        v = e - n1
        if v >= 0 and s > m[v]:
            m[v] = s
        
print(m[0])