<?php
/**
 *
 */

$increased = 0;
$inputStream = fopen('input', 'r');
$previousReading = (int)fgets($inputStream);
while (($line = fgets($inputStream)) !== false) {
    $line = (int)$line;
    if ($line > $previousReading) {
        $increased++;
    }
    $previousReading = $line;
}
fclose($inputStream);
echo $increased; //1553