//#include <monsterenergy>
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
const int MAX = 1e9;
const int MIN = -1*1e9;
const ll MAXLL = 1e18;
const ll MINLL = -1*1e18;

int main()
{
    ll N,Ans=0; cin >> N;
    ll S = (1+N)*N/2;
    vector<int> V(N+1);
    for(int i = 1; i <= N; i++)
    {
        int A; cin >> A;
        V[A] = i;
    }

    ll P = 0;
    for(int i = N; i >= 1; i--)
    {
        P += V[i];
        Ans = max(Ans,S-V[i]*2);
        S -= V[i];
    }
    cout << Ans << endl;
    return 0;
}