#include<iostream>
#include<bits/stdc++.h>
using namespace std;
struct water{
int id,time;
}a[1010];
bool cmp(water a,water b){
return a.time<b.time;
}
int main(){
int n,sum1=0,sum2=0;
cin>>n;
for(int i=0;i<n;i++){
cin>>a[i].time;
a[i].id=i+1;
}
sort(a,a+n,cmp);
for(int i=0;i<n;i++){
cout<<a[i].id<<' ';
}
for(int i=0;i<n-1;i++){
sum1+=a[i].time;
sum2+=sum1;
}
printf("\n%.2f",sum2*1.0/n);
return 0;
}