from math import sqrt,sin,cos,tan,ceil,radians,floor,gcd,exp,log,log10,log2,factorial,fsum
from heapq import heapify, heappop, heappush
from bisect import bisect_left, bisect_right
from copy import deepcopy
import copy
import random
from random import randrange
from collections import deque,Counter,defaultdict
from itertools import permutations,combinations
from decimal import Decimal,ROUND_HALF_UP
#tmp = Decimal(mid).quantize(Decimal('0'), rounding=ROUND_HALF_UP)
from functools import lru_cache, reduce
#@lru_cache(maxsize=None)
from operator import add,sub,mul,xor,and_,or_,itemgetter
import sys
#input = sys.stdin.readline
# .rstrip()
INF = 10**18
mod1 = 10**9+7
mod2 = 998244353

#DecimalならPython
#再帰ならPython!!!!!!!!!!!!!!!!!!!!!!!!!!


'''
Bi < Bj
交換した結果、逆転するといくない
荷物が重いといくない
今までの区間で一番大きい値を持っておく
荷物が軽いほうが良い
体重は重いほうがよくて、荷物は軽いほうがいい
体重-荷物がでかいやつ
二分探索が必要か?
単調増加

2 4 5 8
2 1 6 2

[1,2],[3,4]

'''

N = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))

ls = []

ans = 0

for i in range(N):
    f = bisect_left(ls,A[i]-B[i])
    
    ans += f
    
    ls.append(A[i]-B[i])

print(ans)