#include<bits/stdc++.h> 
using namespace std;
bool compare(int a,int b)
{
	return a<b;
}
int main()
{
	int n;
	double sum,average;
	cin>>n;
	double a[1001],b[1001];
	for(int i=1;i<=n;i++) 
	{
		cin>>a[i];
		b[i]=a[i];
	}
	sort(a+1,a+n+1,compare);
    for(int i=1;i<=n;i++)
    {
      for(int j=1;j<=n;j++)
      {
          if(a[i]==b[j])
          {
              cout<<j<<" ";
          }
      }
    }
    cout<<endl;
	for(int i=1;i<=n;i++) 
	{
		sum+=(n-i)*1.0*a[i];
	}
	average=(double)sum/n;
	printf("%.2f",average);
	return 0;
}