wordpress wp query posts per page default
===

Here is the code:

    <?php if ( have_posts() ) : ?>

				    <?php
					    $temp = $wp_query;
					    $wp_query= null;
					    $wp_query = new WP_Query();
					    $wp_query->query('showposts=5'.'&paged='.$paged);
					    while ($wp_query->have_posts()) : $wp_query- >the_post();
				    ?>

					    <?php get_template_part( 'content', get_post_format() ); ?>

				    <?php endwhile; ?>
				
				    <?php higher_content_nav( 'nav-below' ); ?>


			<?php $wp_query = null; $wp_query = $temp;?>
			
			<?php endif; ?>

How can I show posts per page not 5 but default? I mean post that we can set at back end at Reading Settings, Blog pages show at most - number of post.