typedef long long ll;
typedef long double ld;
#include <bits/stdc++.h>
using namespace std;
#define int long long

signed main(){
    ll n;
    std::cin >> n;
    ll ans = 0;
    vector<ll> pi(n+1);
    for (int i = 0; i < n; i++) {
        ll p;
        std::cin >> p;
        pi[p] = i+1;
    }
    ll now = n*(n+1)/2;
    for (int i = n; i >= 1; i--) {
        ans = max(ans, now-2*pi[i]);
        now -= pi[i];
    }
    std::cout << ans << std::endl;
}