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

ans = 0
i = 0
while i < n:
    if a[i] == b[i]:
        i += 1
    else:
        ans += 1
        while i < n and a[i] != b[i]:
            i += 1

print(ans)