#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>

#include <set>
#include <iterator>
using namespace std;
using namespace __gnu_pbds;


#define f first
#define s second
#define pb push_back
#define all(x) x.begin(),x.end()

#define ll long long int
#define vi vector<int>
#define vii vector<pair<int,int> >
#define pii pair<int,int>
#define plii pair<pair<ll, int>, int>
#define piii pair<pii, int>
#define viii vector<pair<pii, int> >
#define vl vector<ll>
#define vll vector<pair<ll,ll> >
#define pll pair<ll,ll>
#define pli pair<ll,int>
#define mp make_pair
#define ms(x, v) memset(x, v, sizeof x)
#define pr_vec(v) for(int i=0;i<v.size();i++) cout << v[i] << " " ;

#define f_in(st) freopen(st,"r",stdin)
#define f_out(st) freopen(st,"w",stdout)

#define INF INT_MAX
#define matrix vector<vector<ll> >

#define fr(i, a, b) for(i=a; i<=b; i++)
#define fb(i, a, b) for(i=a; i>=b; i--)
#define ASST(x, l, r) assert( x <= r && x >= l )
#define maxbits 9
#define maxmask (1ll<<maxbits)
typedef tree<pll, null_type, less<pll>, rb_tree_tag,
             tree_order_statistics_node_update>
    new_data_set;
const int  N=100000 +10, M=(ll)1e9+1 ;
const int mod =998244353 ,sz=5 ;

void work(){
  ll n;
  cin >> n;
  vl a(n);
  for(ll i=0;i<n;i++){
    cin >> a[i];
  }
  sort(a.begin(),a.end());
  ll ans=0;
  ll cur=a[0];
  for(int i=1;i<n;i++){
    
    cur=(cur+a[i])/2;
  }
  cout << cur;
    
}
int main(){
 ios_base::sync_with_stdio(0);
 cin.tie(0);
    ll t;
    // cin >> t;
    t=1;
    while(t--){
            work();
    }
   return 0;

}
