#include <bits/stdc++.h>
using namespace std;
const int INF = 1000000;
struct monoid{
  int mn, cnt;
  monoid(){
    mn = INF, cnt = 0;
  }
  monoid(int x){
    mn = x, cnt = 1;
  }
};
monoid f(monoid A, monoid B){
  monoid C;
  C.mn = min(A.mn, B.mn);
  if (A.mn == C.mn){
    C.cnt += A.cnt;
  }
  if (B.mn == C.mn){
    C.cnt += B.cnt;
  }
  return C;
}
struct lazy_segment_tree{
  int N;
  vector<monoid> ST;
  vector<int> lazy;
  lazy_segment_tree(int N2){
    N = 1;
    while (N < N2){
      N *= 2;
    }
    ST = vector<monoid>(N * 2 - 1, monoid(0));
    for (int i = N - 2; i >= 0; i--){
      ST[i] = f(ST[i * 2 + 1], ST[i * 2 + 2]);
    }
    lazy = vector<int>(N * 2 - 1, 0);
  }
  void eval(int i){
    if (i < N - 1){
      lazy[i * 2 + 1] += lazy[i];
      lazy[i * 2 + 2] += lazy[i];
    }
    ST[i].mn += lazy[i];
    lazy[i] = 0;
  }
  void range_add(int L, int R, int x, int i, int l, int r){
    eval(i);
    if (r <= L || R <= l){
      return;
    } else if (L <= l && r <= R){
      lazy[i] += x;
      eval(i);
    } else {
      int m = (l + r) / 2;
      range_add(L, R, x, i * 2 + 1, l, m);
      range_add(L, R, x, i * 2 + 2, m, r);
      ST[i] = f(ST[i * 2 + 1], ST[i * 2 + 2]);
    }
  }
  void range_add(int L, int R, int x){
    range_add(L, R, x, 0, 0, N);
  }
  monoid range_fold(int L, int R, int i, int l, int r){
    eval(i);
    if (r <= L || R <= l){
      return monoid();
    } else if (L <= l && r <= R){
      return ST[i];
    } else {
      int m = (l + r) / 2;
      return f(range_fold(L, R, i * 2 + 1, l, m), range_fold(L, R, i * 2 + 2, m, r));
    }
  }
  monoid range_fold(int L, int R){
    return range_fold(L, R, 0, 0, N);
  }
};
int main(){
  int N;
  cin >> N;
  vector<int> A(N);
  for (int i = 0; i < N; i++){
    cin >> A[i];
    A[i]--;
  }
  vector<int> B(N);
  for (int i = 0; i < N; i++){
    cin >> B[i];
    B[i]--;
  }
  long long ans = 0;
  vector<int> Af(400000, N), Bf(400000, N);
  lazy_segment_tree ST(N);
  for (int i = N - 1; i >= 0; i--){
    //[Af,Bf) or [Bf,Af) は NG
    //range add x, rane-min-cnt
    ST.range_add(min(Af[A[i]], Bf[A[i]]), max(Af[A[i]], Bf[A[i]]), -1);
    Af[A[i]] = i;
    ST.range_add(min(Af[A[i]], Bf[A[i]]), max(Af[A[i]], Bf[A[i]]), 1);
    ST.range_add(min(Af[B[i]], Bf[B[i]]), max(Af[B[i]], Bf[B[i]]), -1);
    Bf[B[i]] = i;
    ST.range_add(min(Af[B[i]], Bf[B[i]]), max(Af[B[i]], Bf[B[i]]), 1);
    monoid res = ST.range_fold(i, N);
    if (res.mn == 0){
      ans += res.cnt;
    }
  }
  cout << ans << endl;
}