from sys import stdin

N = int(stdin.readline())

A = list(map(int,stdin.readline().split()))
B = list(map(int,stdin.readline().split()))

ans = 0
now = 0
for i in range(N):

    if A[i] ^ B[i] == 1:
       if now == 0:
           now = 1
           ans += 1
    else:
        now = 0

print (ans)