n = int(input())
a = list(map(int, input().split()))
b = list(map(int, input().split()))

cnt = 0
i = 0
j = 0
while i < n:
    while i < n and a[i] == b[i]:
        i += 1
    if i == n:
        break
    j = i+1
    while j < n and a[j] != b[j]:
        j += 1
    i = j
    cnt += 1
print(cnt)