#include<bits/stdc++.h>
using namespace std;

int main()
{
    int n=0,h=0,i=1,i2;
    cin>>i2;
    while(i<=i2)
    {
        scanf("%d ",&n);
        if(n%2==0)
        {
            h=h+n;
        }
        i++;
    }
    cout<<h;
    return 0;
}