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
        continue
    if A[i] != B[i]:
        ans += 1
        while i < N and A[i] != B[i]:
            i += 1
print(ans)