#include <bits/stdc++.h>

#define foreach(i, v) for(__typeof((v).begin()) i = (v).begin(); i != (v).end(); ++ i)
#define BETWEEN(a, x, b) (a<=x&&x<b)

using namespace std;
typedef long long ll;

int main(int argc, char *argv[]) {
  ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.tie(nullptr);

  int n;cin>>n;
  std::vector<int> v;
  for(int i=0;i<n;i++){
    int a;cin>>a;
    v.push_back(a);
  }
  sort(v.begin(), v.end());
  if(n % 2 == 1)cout<<v[n/2]<<endl;
  else cout<<(v[n/2] + v[n/2-1])/2.0<<endl;

  return 0;
}