N=int(input())
A=list(map(int, input().split()))
B=list(map(int, input().split()))
A=sorted(A)
import bisect
D=[]
ans=0
for i in range(N):
  bisect.insort_left(D,B[i])
  d=bisect.bisect_left(D,A[i])
  ans+=d
print(ans)