sochan

/******************************************************************************

                              Online C++ Compiler.
               Code, Compile, Run and Debug C++ program online.
Write your code in this editor and press "Run" button to compile and execute it.

*******************************************************************************/

#include <iostream>

using namespace std;

int main()
{
    int n;
    cin >> n;
    double s=0 , count =0;
    for (int i=1;i<=n;i++){
        int x;
        cin >> x;
        if ( x%2==0 ){
            s+=x;
            count ++ ;
        }
    }

    cout<<"TB cac so chan = "<<s/count;

    return 0;
}