import java.util.*;

public class Main {
	public static void main(String[] args) throws Exception {
 		//入力された値の取得
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		//計算
		int answer = a + a * a + a * a * a;
		//出力
		System.out.println(answer);
	}
}

/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