#include <cstdio>
#include <iostream>
#include <string>
#include <sstream>
#include <stack>
#include <algorithm>
#include <cmath>
#include <queue>
#include <map>
#include <set>
#include <cstdlib>
#include <bitset>
#include <tuple>
#include <assert.h>
#include <deque>
#include <bitset>
#include <iomanip>
#include <limits>
#include <chrono>
#include <random>
#include <array>
#include <unordered_map>
#include <functional>
#include <complex>

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

const long long MAX = 5100000;
const long long INF = 1LL << 60;
const int inf = 1 << 28;
const long long mod = 1000000007LL;
//const long long mod = 998244353LL;

using namespace std;
typedef unsigned long long ull;
typedef long long ll;


int main()
{
	/*
	cin.tie(nullptr);
	ios::sync_with_stdio(false);
	*/

	ll N; scanf("%lld", &N);
	vector<ll> a(N); for (int i = 0; i < N; i++) scanf("%lld", &a[i]);
	sort(a.begin(), a.end());
	vector<ll> sum(N + 1); for (int i = 0; i < N; i++) sum[i + 1] = sum[i] + a[i];
	ll res = 0;
	for (ll i = 1; i < N - 1; i++) {
		ll left = 1;
		ll right = min(i, N - i - 1) + 1;
		while (right - left > 1) {
			ll mid = (left + right) >> 1;
			if (a[N - mid] + a[i - mid] >= a[i] * 2) left = mid;
			else right = mid;
		}
		ll tmp = sum[N] - sum[N - left] + sum[i] - sum[i - left] - a[i] * 2 * left;
		chmax(res, tmp);
	}
	cout << res << endl;
	/*
		おまじないを使ったらscanfとprintf関連注意！！！！！！！！！！！！
	*/
}