#include <bits/stdc++.h>
#include <atcoder/fenwicktree.hpp>
using namespace std;

using i32 = int;
using i64 = long long;
using i128 = __int128_t;
using f64 = double;
using p2 = pair<i64, i64>;
using p3 = tuple<i64, i64, i64>;

void _main();
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(18);
  _main();
}

void _main() {
  i64 n;
  cin >> n;
  vector<i64> t(n);
  for (i64 i = 0; i < n; i++) cin >> t[i];
  sort(t.begin(), t.end());
  i64 ans = 0;
  i64 s = 0;
  for (i64 i = 0; i < n; i++) {
    ans += t[i] * i - s;
    s += t[i];
  }
  cout << ans << "\n";
}