#include<iostream>
#include<string>
#include<fstream>
#include<iomanip>

using namespace std;
int main()
{
   //ifstream cin("0000.txt");
   int n,aa[10000];
   cin>>n;
   for(int i=0;i<n;i++)
   cin>>aa[i];
   sort(aa,aa+n);
   unsigned long long sum=0,temp;
   for(int i=n-2;i>=0;i--)
   {temp=(aa[i+1]-aa[i]);
       sum+=temp*(n-i-1)*(i+1);        
   }
   cout<<sum*2<<endl;
   //system("pause");
   return 0;
}

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