import java.io.*;

public class LireLigneClavier {

  public static void main(String[] args) throws IOException {
  
    BufferedReader inr = 
      new BufferedReader(new InputStreamReader(System.in));
    
    System.out.print("tapez un nombre: ");
      
    String s = inr.readLine();
    
    int a = Integer.parseInt(s);
    
    System.out.println(a*a); // imprime a au carre
  }
}