import sys
input=lambda: sys.stdin.readline().rstrip()
n=int(input())
A=[int(i) for i in input().split()]
B=[int(i) for i in input().split()]
D=dict()
for i,a in enumerate(A):
  D[a]=i
C=[]
for b in B:
  C.append(D[b]+1)

n_max=10**5
nn=n_max.bit_length()+1
BIT=[0]*(2**nn)
BIT.insert(0,0)

def bitsum(BIT,i):
  s=0
  while i>0:
    s+=BIT[i]
    i-=i&(-i)
  return s

def bitadd(BIT,i,x):
  while i<=2**nn:
    BIT[i]+=x
    i+=i&(-i)
  return BIT

ans=0
for i in range(n):
  ans+=i-bitsum(BIT,C[i])
  bitadd(BIT,C[i],1)
print(ans)