# ifndef ONLINE_JUDGE
# define _GLIBCXX_DEBUG
# endif
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vi = vector<int>;
using vvi = vector<vector<int>>;
using pii = pair<int, int>;
# define rep(i, n) for(int i = 0; i < (int)(n); ++i)
# define all(v) v.begin(), v.end()

int main(){
  constexpr char endl = '\n';
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  cout << fixed << setprecision(10);
  //input();
  int N;cin >> N;
  vi P(N);
  for(auto &&e : P)  cin >> e;
  //solve();
  vector<pii> point(N);
  rep(i, N){
    point[P[i]-1] = make_pair(P[i], i+1);
  }
  reverse(all(point));
  int ans = 0;
  int sum = N*(N+1)/2;
  rep(i, N){
    sum -= 2*point[i].second;
    ans = max(ans, sum);
    sum += point[i].second;
  }
  //output();
  cout << ans << endl;
}