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<?php
$f = trim(fgets(STDIN));
$arr = trim(fgets(STDIN));
$arr = explode(" ", $arr);
$i=0;
while (1)
{
$g = 0;
foreach ($arr as $key => $val)
{
if ($key != 0 && $key != count($arr) - 1)
{
if (($val > $arr[$key - 1] && $val > $arr[$key + 1]) || ($val < $arr[$key - 1] && $val < $arr[$key + 1]))
{
continue;
}
else
{
$g++;
$i++;
$arr[$key] = NULL;
$arr = array_filter($arr);
foreach ($arr as $v) $out[] = $v;
$arr = $out;
$out = NULL;
break;
}
}
}
if ($g === 0) {
echo $i;
die;
}
}
?>
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AT
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