<?php
  #require_once('flag.php');
  if ($_ = @$_GET['pass']) {
    echo 'pass: '.$_.'<br>';
    echo 'md5 of pass: '.md5($_).'<br>';
    $ua = $_SERVER['HTTP_USER_AGENT'];
    echo 'md5 of user: '.md5($ua).'<br>';
    if (md5($_)==md5($ua))
    {
        echo "lol you did it";
    }
    if (md5($_) + $_[0] == md5($ua)) {
      if ($_[0] == md5($_[0] . $flag)[0]) {
        echo $flag;
      }
    }
  } else {
    echo 'failed';
  }
?>