WordPress conditional post

<?php
$the_query = new WP_Query( array( 'posts_per_page' => 7 ) );
if ( $the_query->have_posts()) : ?>
<?php $count = 0; ?>
<?php while ($the_query->have_posts()) : $the_query->the_post(); ?>
<?php $count++; ?>



  <?php if ($count == 1) : ?>

    <div class="third_post single-latest">
       <a href="<?php the_permalink(); ?>"> <?php the_title(); ?></a>
        <?php the_post_thumbnail('post-image'); ?>
        <?php the_excerpt(); ?>
    </div>

  <?php elseif ($count == 2) : ?>
    <div class="fourth_post single-latest">

        <a href="<?php the_permalink(); ?>"> <?php the_title(); ?></a>
        <?php the_post_thumbnail('post-image'); ?>
        <?php the_excerpt(); ?>
    </div>

   <?php else : ?>
    <div class="single_post single-latest">
         <a href="<?php the_permalink(); ?>"> <?php the_title(); ?></a>
          <?php the_excerpt(); ?>
    </div>





<?php endif; ?>
<?php endwhile; ?>
<?php endif; ?>