C++ :

#include<iostream>
#include<cstring>
#include<cstdio>
#include<cmath>
#include<algorithm>
using namespace std;
int n;
int a[10010];
void init();
void work();
int main()
{
	init();
	work();
	return 0;
}
void init()
{
	//freopen("test5.in","r",stdin);
	cin>>n;
	for(int i=1;i<=n;++i)cin>>a[i];
	//for(int i=1;i<=n;++i)cout<<a[i]<<' ';
}
void work()
{
	
	sort(a+1,a+n+1);
	long long sum=0;
	for(long long i=1;i<n;++i)
	{
		sum+=(a[i+1]-a[i])*i*(n-i);
	}
	cout<<2*sum<<endl;
}