#include <bits/stdc++.h>

using namespace std;

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

    int n;
    cin >> n;
    vector<int> v(n);

    for (int i=0; i<n; ++i)
        cin >> v[i];

    sort(v.begin(), v.end());
    
    if (n & 1)
    {
        cout << v[n/2] << "\n";
    }
    else
    {
        cout << (v[n/2-1]+v[n/2])/2.0 << "\n";
    }
	return 0;
}