import sys
def input(): return sys.stdin.readline().strip()
def mapint(): return map(int, input().split())
sys.setrecursionlimit(10**9)

N = int(input())
As = list(mapint())+[-1]
Bs = list(mapint())+[-1]

cnt = 0
ans = 0
for i in range(N+1):
    if As[i]==Bs[i]:
        if cnt>0:
            ans += 1
            cnt = 0
    else:
        cnt += 1
print(ans)