#include<bits/stdc++.h>
using namespace std;
struct w{
    int t,num;
}a[1001];
int n,sum;
double p;
bool cmp(w x,w y){
    return x.t<y.t;
}
int main(){
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>a[i].t;
        a[i].num=i;
    }
    sort(a+1,a+n+1,cmp);
    for(int i=1;i<=n;i++) cout<<a[i].num<<" ";
    for(int i=n-1;i>=1;i--) sum+=a[n-i].t*i;       
    cout<<endl;
    p=sum/n;
    printf("%.2lf",p);
    //delete[] a;
    return 0;
}