#include<bits/stdc++.h>

#define ll long long
#define IO ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);

using namespace std;

int a[100000],b[100000];
int n;
ll double ans=0;
//10 
//56 12 1 99 1000 234 33 55 99 812
int main()
{
	//IO
	cin>>n;
	for (int i=1;i<=n;i++)
	{
		cin>>a[i];
		b[i]=a[i];
		//ans+=a[i]*(n-i);
	}
	for (int i=1;i<=n;i++) 
	{
		a[i]=a[i]*1000+i;
	}
	sort(a+1,a+n+1);
	sort(b+1,b+n+1);
	for (int i=1;i<=n;i++) ans+=b[i]*(n-i);
	for (int i=1;i<=n;i++)
	{
		if (i!=n){
			cout<<(a[i]%1000)<<' ';
		}
		if (i==n)
		{
			cout<<(a[i]%1000)<<endl;
		}
	}
	cout<<fixed<<setprecision(2)<<ans/n;
	return 0;
}