#include <iostream>
 
using namespace std;
 
int main()
{
    int n;
    double suma=0;
    cout << "Unesite broj clanova niza:";
    cin >> n;
    int a[n];
    cout << "Unesite clanove niza:"<<endl;
    for (int i=0; i< n; i++){
        cout<<i<<"-->";
        cin>>a[i];
    }
    cout << "-----------" << endl;
    for (int i=0; i< n; i++){
        if(i % 2 ==0)
        {
        suma=suma+a[i];
        }
    }
    cout<<"Suma iznosi:"<<suma<<endl;
   
    return 0;
}