subroutine main()
	integer :: i, j
	integer :: k, z
	
	!<<<<<START
	do j = 1, 15
	    do i = 1, 10
	        do k = 1,20
	            print *, i                   
	            if (i .gt. j) then
	                print *, i * 10
	            end if                      
	            print *, i
	        end do
	    end do
	end do
	!<<<<<END

end subroutine