//PROGRAM 4-30
class DemoWhileBersarang {	
  public static void main(String[] args) {	
    
    int i=1, j;
    while (i<=5) {
    	j=1;
    	while (j<=i) {
    	  System.out.print(i*j + " ");
    	  j++;
    	}    	
    	System.out.println();
    	i++;
    }
  }
}