#include <iostream>
#include <bits/stdc++.h> 
using namespace std;
int n,s[1005];long sum;
struct lp{
	int id;
	int m;
}a[1005];
int cmp(lp x,lp y)
{
	if(x.m<y.m){
		return 1;
	}
	if(x.m==y.m&&x.id<y.id)return 1;
	return 0;
}
int main()
{
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		cin>>a[i].m;
		s[i]=s[i-1]+a[i].m;
		a[i].id=i;
	}
	sort(a+1,a+n+1,cmp);
	for(int i=1;i<=n;i++)
	{
		cout<<a[i].id<<" ";
	}
	for(int i=1;i<=n;i++)
	{
		sum+=a[i].m*(n-i);
	}
	cout<<fixed<<setprecision(2)<<endl<<sum*1.0/n;
	return 0;
}