public class NestedForLoop {
   public static void main(String[] args) {
      for (int i=1; i<=5; i++) {      // loop 5 times
		   for (int j=1; j<=i; j++) {   // loop from 1 to i
			   System.out.print("X");    // print an X
			}
         System.out.println();        // go to the next line
		}                         
	}
}