import java.util.Scanner;

/**
 *
 * @author HP
 */
public class Main {
   public static void main(String[] args) {
       Scanner s= new Scanner(System.in);
       int a = s.nextInt();
       long res = a;
       res += a*a +a*a*a;
       System.out.println(res);
   }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz