If Statement in php leading to parse error

I have to develop a code which meet certain logic

Here

count( $replies ) - calculate total replies on page

$replynumber - is what every reply which is 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 etc based on total number of replies done by users in the post

I am trying to dispaly custom advertising script based on adsense and other ad script depending on replies

<?php 

if( count( $replies ) <= 3 )
                {   
                 <script>       
                    Script 1 to display
                 </script>
                }

else if(((count( $replies ) > 3) and (count( $replies ) <= 6)) and ($replynumber == '1','3','5'))
                {           
                 <script>       
                    Script 2 to display
                 </script>
                }

else if(((count( $replies ) > 6) and (count( $replies ) <= 12)) and ($replynumber == '1','4','7','10'))
                {           
                 <script>       
                    Script 3 to display
                 </script>              }               
               }
else if( count( $replies ) > 12 )
                {           
                 <script>       
                    Script 4 to display
                 </script>
                }                           
?>  

But this is leading to parse error Can any one help on it please