#include <iostream>
#include <climits>


using namespace std;

int main()
{
    int a[1000], n, S= 0 , x = 0, y = 0   ;

    cin >> n ;
    for ( int i = 0 ; i < n ; i ++ )
        cin >> a[i] ;
    for ( int i =0 ; i <n ; i ++ )
    {
        if ( a [i ]% 2 ==0 )
        {
          x= i;
          break ;
        }
    }
  for ( int i = n ; i >= 0 ; i -- )

  {
      if ( a[i]% 2 == 0 )
      {
          y = i;
          break ;
      }
  }
  for ( int i = x  ; i <= y ; i ++ )
  {
     S+= a[i];
  }

    cout << S ;






    return 0;
}