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<p>Given an integer <code>n</code>, count <em>the total number of digit </em><code>1</code><em> appearing in all non-negative integers less than or equal to</em> <code>n</code>.</p>
<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>
<pre>
<strong>Input:</strong> n = 13
<strong>Output:</strong> 6
</pre>
<p><strong>Example 2:</strong></p>
<pre>
<strong>Input:</strong> n = 0
<strong>Output:</strong> 0
</pre>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>
<ul>
<li><code>0 &lt;= n &lt;= 10<sup>9</sup></code></li>
</ul>