#include<bits/stdc++.h>
#define int long long 
using namespace std;
struct da{
	int id,t;
}a[1005];
bool cmp(da a1,da b1){
	if(a1.t>=b1.t)
	{
		return 0;
	}
	return 1;
}
int sum[1005];
signed main()
{
	int n;
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i].t;	
		a[i].id=i;
	}
	sort(a+1,a+1+n,cmp);
	double ans=0;
	double r=n;
	for(int i=1;i<=n;i++){
		sum[i]=sum[i-1]+a[i].t;
		ans+=sum[i-1];
		cout<<a[i].id<<" "; 
	}
	cout<<endl<<fixed<<setprecision(2)<<ans/r;
	return 0;
}