import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		long n = scan.nextLong();
		scan.close();
		long d = 1000000007;
		long ans = 1;
		ans = n * (2 * n - 1);
		ans = ans % d;
		ans = ans * n % d;
		System.out.println(ans);
	}
}