How I can do this in Crystal Reports?

I have to create a formula to limit the registrtions in my report. it is something like this:

If {sp_rep_comite.vnumero_cte}< '00' then {sp_rep_comite.vnumero_cte} Else

If {sp_rep_comite.vnumero_cte} > '00' then

{sp_rep_comite.vnumero_cte}

Else

If {sp_rep_comite.vnumero_cte} > '04'then

""

Else if {sp_rep_comite.vnumero_cte}< '04' then {sp_rep_comite.vnumero_cte}

but it does not work.