#include "testlib.h"
#include<bits/stdc++.h>
using namespace std;

using ll = long long;
using pll = pair<ll,ll>;

int main(){
	registerValidation();
	ll n = inf.readInt(1,200000,"n");
	inf.readEoln();
	vector<pll> ar(n);
	for (int i = 0; i < n; i++){
	    ll c = inf.readInt(1,n,"c");
	    ar[i] = pll(-c,ll(i+1));
	    if (i == n-1) inf.readEoln();
	    else inf.readSpace();
	}
	sort(ar.begin(),ar.end());
	if (n == 1){
	    assert(ar[0].first == -1);
	    cout << 0 << endl;
	    inf.readEof();
	    return 0;
	}
	ll f = n * (n + 1) / 2;
	ll ima = 2 * ar[0].second;
	ll mi = ima;
	for (int i = 0; i < n-1; i++){
	    ima = ima - ar[i].second + 2 * ar[i+1].second;
	    if (i == n-2) ima -= ar[i+1].second;
	    mi = min(mi,ima);
	}
	for (int i = 0; i < n; i++){
	    assert(n+ar[i].first == i);
	}
	cout << f - mi << endl;
	inf.readEof();
	return 0;
}