import sys

def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))

n=II()
aa=LI()+[0]
bb=LI()+[0]
ans=0
for i in range(n):
    if aa[i]!=bb[i] and aa[i+1]==bb[i+1]:ans+=1
print(ans)