import java.util.Scanner;
class Main {
    static Scanner scan = new Scanner(System.in);
    public static void main(String[] args) {
        int a = scan.nextInt();
        System.out.println(equationOutput(a));
    }

    private static long equationOutput(int a) {

        if(a == 0) {
            return 0;
        }
        long sum = 0;
        if(a != 1) {
            long gp =  (a * ((long)Math.pow(a, 3) - 1)) / (a - 1);
            sum = gp;
        } else {
            sum = a + (long)Math.pow(a, 2) + (long)Math.pow(a, 3);
        }

        return sum;
    }
}

/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