public static void main(String[] agrs) {
Scanner scanenr = new Scanner(System.in);
int[] sum = new int[5];
boolean flag = false;
for (int x = 0; x < sum.length; x++) {
sum[x] = scanenr.nextInt();
}
for (int i = 0; i < sum.length; i++) {
if (sum[i % 2 == 0]) {
System.out.println(sum[i] + i);
}
}
if (flag == false){
System.out.println("NULL");
scanner.close();
}
}
}