Pyramid For a Given Number in Java

import java.io.BufferedReader;
import java.io.InputStreamReader;
 
public class Pyramid {
       
        public static void main (String[] args) throws Exception{
               
                BufferedReader keyboard = new BufferedReader (new InputStreamReader (System.in));
               
                System.out.println("Enter Number:");
                int as= Integer.parseInt (keyboard.readLine());
                System.out.println("Enter X:");
                int x=   Integer.parseInt (keyboard.readLine());
                 
                int y = 0;
               
                for(int i=0; i<= as ;i++){
                       
                        for(int j=1; j <= i ; j++){
                                System.out.print(y + "\t");
                                y = y + x;
                        }
                       
                        System.out.println("");
                }
        }
}