//P1223
#include<bits/stdc++.h>
#define sc scanf
#define pr printf
using namespace std;
struct people
{
	int scan,min;//号数,时间 
}a[2000];
bool cmp(people a,people b);
int n;
float ans;
int main()
{
	sc("%d",&n);
	for(int i=1;i<=n;i++)
	{
		sc("%d",&a[i].min);
		a[i].scan=i;
	}
	sort(a+1,a+n+1,cmp);
	for(int i=1;i<=n;i++)
		ans+=(float)a[i].min*(float)(n-i);
	for(int i=1;i<=n;i++)
		pr("%d ",a[i].scan);
	pr("\n%.2lf",(float)ans/(float)n);
	return 0;
}
bool cmp(people a,people b)
{
	if(a.min<b.min)
		return true;
	return false;
}