#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#define ll long long
#define rep(i,n) for(ll i=0;i<(n);i++)
#define pll pair<ll,ll>
#define pii pair<int,int>
#define pq priority_queue
#define pb push_back
#define eb emplace_back
#define fi first
#define se second
#define endl '\n'
#define ios ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define lb(c,x) distance(c.begin(),lower_bound(all(c),x))
#define ub(c,x) distance(c.begin(),upper_bound(all(c),x))

using namespace std;


template<class T> inline bool chmax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
template<class T> inline bool chmin(T& a,T b){if(a>b){a=b;return 1;}return 0;}


int main(){
    ll n;
    cin >> n;
    vector<ll> a(n),b(n);
    ll cnt=0;
    ll ans=0;
    rep(i,n){
        cin >> a[i];
    }
    rep(i,n){
        cin >> b[i];
    }
    rep(i,n){
        if(a[i]!=b[i]) cnt=1;
        if(a[i]==b[i]){
            ans+=cnt;
            cnt=0;
        }
    }
    ans+=cnt;
    cout << ans << endl;
    return 0;
}