代码：

#include <bits/stdc++.h>
using namespace std;
#define int unsigned long long 
int n,a[1000005],Heap[1000005],ans,cnt;
bool cmp(int a,int b)
{
	if(a>b)
	{
		return true;
	}
	return false;
}
signed main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		cin>>a[i];
		cnt++;
		Heap[cnt]=a[i];
		push_heap(Heap+1,Heap+cnt+1,cmp);
	}
	for(int i=1;i<=n-1;i++)
	{
		int min1=Heap[1];
		pop_heap(Heap+1,Heap+cnt+1,cmp);
		cnt--;
		int min2=Heap[1];
		pop_heap(Heap+1,Heap+cnt+1,cmp);
		cnt--;
		int s=min1+min2;
		ans+=s;
		cnt++;
		Heap[cnt]=s;
		push_heap(Heap+1,Heap+cnt+1,cmp);
	}
	cout<<ans<<"\n";
	return 0;
}