"""

https://yukicoder.me/problems/no/1282
Aはちいさいほうから出すべき

貪欲ではない？

B 100 50 1
A 101 51 1

"""

from sys import stdin

def bitadd(a,w,bit): #aにwを加える(1-origin)
    a += 1
    x = a
    while x <= (len(bit)-1):
        bit[x] += w
        x += x & (-1 * x)
 
def bitsum(a,bit): #ind 1～aまでの和を求める
    a += 1
    ret = 0
    x = a
    while x > 0:
        ret += bit[x]
        x -= x & (-1 * x)
    return ret

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

a.sort()

lis = []
dic = {}
for i in b:
    if i not in dic:
        dic[i] = 0
        lis.append(i)
lis.sort()
for i in range(len(lis)):
    dic[lis[i]] = i

ans = 0
BIT = [0] * (len(lis)+5)

cnt = 0
for i in a:

    bitadd(dic[b[cnt]] , 1 , BIT)
    
    l = -1
    r = len(lis)

    while r-l != 1:
        m = (l+r)//2
        if lis[m] >= i:
            r = m
        else:
            l = m

    if l != -1:
        ans += bitsum(l,BIT)
    cnt += 1

print (ans)