from bisect import bisect_left

N = int(input())
a = list(map(int, input().split()))
b = list(map(int, input().split()))

a.sort()
t = []
result = 0
for i in range(N):
    t.append(b[i])
    t.sort()
    result += bisect_left(t, a[i])
print(result)