/* helder.correia@fe.up.pt
 * Data: 28-02-2005
 *
 * aula prática 1 (grupo 2, ponto 1)
 */

#include <iostream>
using namespace std;

int main() {
  int num = 0;
  while (!cin.eof()) {
    cin >> num; 
    if (num%2 == 0) cout << num << endl;
  } 
  return 0;
}