Crystal Reports display consecutive record numbers

Message

   I want to display record number (ie. serial number). Here is some problem.
when i am suppress some fields. that shows 1,3,4,8 like that . I want 1,2,3 like that.

ex.  

s.no    name   incometax

  1.      xxxx         5000
   2.      yyyy         1000
  3.       zzzz         0
  4.     aaaa          0
   5.    ttttt             6000

here it display
 1.      xxxx         5000
 2.      yyyy         1000
 5.      ttttt          6000

any one help me  pls.......