#include <bits/stdc++.h>
using namespace std;
using ll = long long;
template <class T> using vec = vector<T>;
template <class T> using vvec = vector<vec<T>>;
template <class T> using vvvec = vector<vvec<T>>;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    int N;
    cin >> N;
    vec<int> A(N),B(N);
    for(auto& x:A) cin >> x;
    for(auto& x:B) cin >> x;
    int ans = 0;
    for(int l=0;l<N;l++){
        if(A[l]==B[l]) continue;
        int r = l+1;
        while(r<N && A[r]!=B[r]) r++;
        ans++;
        l = r-1;
    }
    cout << ans << "\n";
}