#include<bits/stdc++.h>
using namespace std;
#define int long long
const int N=3e5+5;
int a[N];
signed main(){
	int n,sum=0,cnt=0;
	cin>>n;
	for(int i=1;i<=n;++i) cin>>a[i],sum+=a[i];
	sort(a+1,a+n+1);
	a[n+1]=100000000;
	for(int i=1;i<=n;++i){
		int x=100000000-a[i];
		int l=lower_bound(a+1,a+n+1,x);
		cnt+=(n-l+1);
	}sum*=(n-1);
	cout<<sum-cnt*100000000<<endl;
	return 0;
}