from bisect import *

N = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
D = list(map(int, input().split()))
D.sort()
dp = [[-1]*(N+1) for _ in range(N+1)]
dp[0][0] = (N, 0)

for i in range(N+1):
    for j in range(N+1):
        if i+j>N:
            break
        
        if i==0 and j==0:
            continue
        
        if i>0:
            idx1, solved1 = dp[i-1][j]
            
        if j>0:
            idx2, solved2 = dp[i][j-1]
            
        mark = bisect_right(D, A[i]+B[j])
        
        if i!=0 and (j==0 or (solved1==solved2 and idx1>idx2) or solved1>solved2):
            if mark==0 or idx1==0:
                dp[i][j] = (idx1, solved1)
            else:
                if mark-1>=idx1:
                    dp[i][j] = (idx1-1, solved1+1)
                else:
                    dp[i][j] = (mark-1, solved1+1)
        else:
            if mark==0 or idx2==0:
                dp[i][j] = (idx2, solved2)
            else:
                if mark-1>=idx2:
                    dp[i][j] = (idx2-1, solved2+1)
                else:
                    dp[i][j] = (mark-1, solved2+1)

ans = 0

for i in range(N+1):
    ans = max(ans, dp[i][N-i][1])

print(ans)