from bisect import bisect_left

class BIT():
    def __init__(self, init):
        if type(init) == int:
            self.n = init + 1
            self.X = [0] * self.n
        else:
            self.n = len(init) + 1
            self.X = [0] + init
            for i in range(1, self.n):
                if i + (i & -i) < self.n:
                    self.X[i + (i & -i)] += self.X[i]
            
    def add(self, i, x=1):
        i += 1
        while i < self.n:
            self.X[i] += x
            i += i & (-i)
 
    def getsum(self, i):
        ret = 0
        while i != 0:
            ret += self.X[i]
            i -= i&(-i)
        return ret
 
    def getrange(self, l, r):
        return self.getsum(r) - self.getsum(l)
 
def inversion_number(L):
    bit = BIT(len(L))
    ret = 0
    for i, a in enumerate(L):
        ret += i - bit.getsum(a + 1)
        bit.add(a)
    return ret

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 = inversion_number(l)
print(ans)