import java.util.Arrays;
import java.util.Scanner;

public class Main implements Runnable {
    public static void main(String[] args) {
        new Thread(null, new Main(), "", 512 * 1024 * 1024).start();
    }

    public void run() {
    	Scanner sc=new Scanner(System.in);
    	int N=sc.nextInt();
    	System.out.println(N*N);
    }
    
    void tr(Object...objects) {System.out.println(Arrays.deepToString(objects));}
}