Wordpress - Different html for posts within loop -

what i'm trying do:

write elseif statement in loop display different html markup first, second , third posts on page.

the code

  <div id="content">          <?php if (have_posts()) : ?>              <?php $count = 0; ?>              <?php while (have_posts()) : the_post(); ?>              <?php $count++; ?>              <?php if ($count == 1) : ?>                <!-- 1st post -->              <article <?php post_class() ?> id="post-<?php the_id(); ?>">                  //the html first post                 <?php the_title(); ?> //etc              </article> <!-- end div post -->               <?php elseif : ?>             <?php if ($count == 2) : ?>               <article <?php post_class() ?> id="post-<?php the_id(); ?>">                 //second post                                    <?php the_title(); ?> //etc               </article> <!-- end div post -->               <?php elseif : ?>             <?php if ($count == 3) : ?>               <article <?php post_class() ?> id="post-<?php the_id(); ?>">                 //third post                                     <?php the_title(); ?> //etc               </article> <!-- end div post -->               <?php else : ?>          <article <?php post_class() ?> id="post-<?php the_id(); ?>">             other posts                  <?php the_title(); ?> etc           </article> <!-- end div post -->       <?php endif; ?>      <?php endwhile; ?>     <?php endif; ?>       </div> <!-- end div content --> 

what's happening:

nothing. i'm doing wrong. i've commented code should have idea of i'm trying achieve here. perhaps can point me in right direction!

here's working code, first post has different markup others.

<div id="content">                  <?php if (have_posts()) : ?>                      <?php $count = 0; ?>                      <?php while (have_posts()) : the_post(); ?>                      <?php $count++; ?>                      <?php if ($count == 1) : ?>                        <!-- 1st post -->                      <article <?php post_class() ?> id="post-<?php the_id(); ?>">                          //the html first post                         <?php the_title(); ?> //etc                      </article> <!-- end div post -->                          <?php else : ?>                  <article <?php post_class() ?> id="post-<?php the_id(); ?>">                     other posts                          <?php the_title(); ?> etc                   </article> <!-- end div post -->               <?php endif; ?>              <?php endwhile; ?>             <?php endif; ?>               </div> <!-- end div content --> 

i want expand have different html first, second , third posts.

problem

 <?php elseif : ?>  <?php if ($count == 3) : ?> 

it's should

elseif($count == 3) : 

better way

you can use get_template_part reduce complexity nested if. created separate templates articlepart.php , articlepart-1.php etc.

if(have_posts()): $count = 0;     while (have_posts()) : the_post();         $count++;         get_template_part('articlepart', $count);      endwhile; endif;