#include <iostream>
using namespace std;
int x, y[10000], z, i;
int main()
{
    cout << "Podaj ilosc liczb (minimum 3)" << endl;
    cin >> x;
    for (i = 0; i < x; i++)
    {
        cout << "Podaj " << i+1 << " liczbe" << endl;
        cin >> y[i];
    }
    z += y[1] + y[x-2];
    cout << "Srednia wynosi " << z / 2 << endl;
}