N=int(input())
A=list(map(int,input().split()))
B=list(map(int,input().split()))
D=sorted(map(int,input().split()),reverse=True)

DP=[[-1]*(N+1) for i in range(N+1)]
DP[0][0]=0

for s in range(N):
    for i in range(s+1):
        now=DP[i][s-i]
        if now==-1:
            continue

        next1=A[i+1]+B[s-i]

        for j in range(now,N):
            if next1>=D[j]:
                DP[i+1][s-i]=max(j+1,DP[i+1][s-i])
                break

        next2=A[i]+B[s-i+1]

        for j in range(now,N):
            if next2>=D[j]:
                DP[i][s-i+1]=max(j+1,DP[i][s-i+1])
                break

ANS=0
for i in range(N+1):
    for j in range(N+1):
        if DP[i][j]!=-1:
            ANS=max(ANS,i+j)
print(ANS)