from bisect import bisect_left

def count_inversion(sequence):
    return sum(sum(m<n for m in sequence[i+1:]) for i,n in enumerate(sequence))

N = int(input())
A = list(map(int,input().split()))
B = list(map(int,input().split()))
b = []
for j in range(N):
    b.append((B[j],j))
b.sort()
l = []

for i in range(N):
    j = bisect_left(b,(A[i],0))
    l.append(b[j][1])
ans = count_inversion(l)
print(ans)