/* -*- coding: utf-8 -*-
 *
 * 3470.cc:  No.3470 螳溯｡梧凾髢薙・蟾ｮ縺ｮ蜷郁ｨ・- yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* constant */

const int MAX_N = 200000;

/* typedef */

using ll = long long;

/* global variables */

int ts[MAX_N];

/* subroutines */

/* main */

int main() {
  int n;
  scanf("%d", &n);
  for (int i = 0; i < n; i++) scanf("%d", ts + i);
  sort(ts, ts + n);

  ll sum = 0, tsum = 0;
  for (int i = 0; i < n; i++) {
    sum += (ll)ts[i] * i - tsum;
    tsum += ts[i];
  }

  printf("%lld\n", sum);
  
  return 0;
}