NN = 17
BIT = [0] * (2 ** NN + 1)
 
def addbit(i, x=1):
    while i <= 2**NN:
        BIT[i] += x
        i += i & (-i)

def getsum(i):
    ret = 0
    while i != 0:
        ret += BIT[i]
        i -= i&(-i)
    return ret

N = int(input())
A = [int(a) for a in input().split()]
B = [int(a) for a in input().split()]
D = {b: i for i, b in enumerate(B)}
A = [D[a] for a in A]

ans = 0
for a in A:
    ans += getsum(a + 1)
    addbit(a + 1)
print(N * (N - 1) // 2 - ans)