#include<bits/stdc++.h>
using namespace std;
int main(){
  
  int N;
  cin >> N;
  
  vector<double> u(N);
  
  for(int i = 0;i < N;++i){
    cin >> u[i];
  }
  
  sort(u.begin(),u.end());
  
  double num;
  double num2 = 0.0;
  
  for(int i = 0;i < N;++i){
    num = (u[num2] + u[i + 1]) / 2;
    num2 = num
  }
  
}