//#include <tourist>
#include <bits/stdc++.h>
//#include <atcoder/all>
using namespace std;
//using namespace atcoder;
typedef long long ll;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef pair<ll, ll> p;
const int INF = 1e9;
const ll LINF = ll(1e18);
const int MOD = 1000000007;
const int dx[4] = {0, 1, 0, -1}, dy[4] = {-1, 0, 1, 0};
const int Dx[8] = {0, 1, 1, 1, 0, -1, -1, -1}, Dy[8] = {-1, -1, 0, 1, 1, 1, 0, -1};
#define yes cout << "Yes" << endl
#define YES cout << "YES" << endl
#define no cout << "No" << endl
#define NO cout << "NO" << endl
#define rep(i, n) for (int i = 0; i < n; i++)
#define FOR(i, m, n) for (int i = m; i < n; i++)
#define ALL(v) v.begin(), v.end()
#define debug(v)          \
    cout << #v << ":";    \
    for (auto x : v)      \
    {                     \
        cout << x << ' '; \
    }                     \
    cout << endl;
template <class T>
bool chmax(T &a, const T &b)
{
    if (a < b)
    {
        a = b;
        return 1;
    }
    return 0;
}
template <class T>
bool chmin(T &a, const T &b)
{
    if (b < a)
    {
        a = b;
        return 1;
    }
    return 0;
}
//cout<<fixed<<setprecision(15);有効数字15桁
//-std=c++14
//g++ yarudake.cpp -std=c++17 -I .
ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
ll lcm(ll a, ll b) { return a / gcd(a, b) * b; }
int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll n, m;
    cin >> n;
    vector<ll> a(n);
    rep(i, n) cin >> a[i];
    vector<ll> b(n, 0), c(n, 0);
    vector<ll> bb(n, INF), cc(n, INF);
    set<ll> s1, s2;
    rep(i, n)
    {
        auto iter = s1.lower_bound(a[i]);
        if (iter != s1.end())
        {
            b[i] = *iter;
        }
        else
        {
            b[i] = INF;
        }
        if (s1.begin() != s1.end())
        {
            if (*s1.begin() < a[i])
            {
                bb[i] = *s1.begin();
            }
        }
        s1.insert(a[i]);
    }
    for (int i = n - 1; i >= 0; i--)
    {
        auto iter = s2.lower_bound(a[i]);
        if (iter != s2.end())
        {
            c[i] = *iter;
        }
        else
        {
            c[i] = INF;
        }
        if (s2.begin() != s2.end())
        {
            if (*s2.begin() < a[i])
            {
                cc[i] = *s2.begin();
            }
        }
        s2.insert(a[i]);
    }
    ll ans = INF;
    rep(i, n)
    {
        chmin(ans, a[i] + b[i] + c[i]);
        chmin(ans, a[i] + bb[i] + cc[i]);
    }
    if (ans == INF)
    {
        cout << -1 << "\n";
    }
    else
    {
        cout << ans << "\n";
    }
}