n=int(input())
a=list(map(int,input().split()))
b=list(map(int,input().split()))
d=list(map(int,input().split()))
d.sort(reverse=True);ans=0
ans=0;i,j,l=0,0,0;c=a[0]+b[0]
for _ in range(n):
    if a[i]-a[i+1]>b[j]-b[j+1]:
        c-=b[j]-b[j+1];j+=1
    else:
        c-=a[i]-a[i+1];i+=1
    while l<n and d[l]>c:
        l+=1
    if l>=n:
        break
    ans+=1;l+=1
print(ans)