import bisect

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

c = a + b
c = list(set(c))
c.sort()

for i in range(N):
    a[i] = bisect.bisect_left(c, a[i])
    b[i] = bisect.bisect_left(c, b[i])

siz = 2 * N + 1
ft = [0] * siz

def add(k, x):
    while(k <= siz):
        ft[k] += x
        k += k & -k
def get(k):
    res = 0
    while k:
        res += ft[k]
        k -= k & -k
    return res

a.sort()
ans = 0
for i in range(N):
    add(b[i] + 1, 1)
    ans += get(a[i])

print(ans)