#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)

void out(){cout<<endl;} template<typename Head,typename... Tail> void out(Head&& head,Tail&&... tail){cout<<head<<" ";out(forward<Tail>(tail)...);}

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  int n;cin>>n;
  int a[n],b[n];
  rep(i,n)cin>>a[i];
  rep(i,n)cin>>b[i];
  int ans=0;
  bool flag=true;
  rep(i,n){
    if(a[i]==b[i]){
      flag=true;
    }else if(a[i]!=b[i]&&flag){
      flag=false;
      ans++;
    }
    //out("i:",i,"a b",a[i],b[i],"flag:",flag,"ans:",ans);
  }
  cout<<ans<<endl;
}