<?php
$credit=40000;
for ($month = 1;$credit >=0;$month++) {
$credit*=1.03;
$credit-=4000;
}
echo "$month месяцев выплачивал";
// your code goes here
PD9waHAKZXJyb3JfcmVwb3J0aW5nKC0xKTsKJGNyZWRpdD00MDAwMDsKZm9yICgkbW9udGggPSAxOyRjcmVkaXQgPj0wOyRtb250aCsrKSB7CgkkY3JlZGl0Kj0xLjAzOwoJJGNyZWRpdC09NDAwMDsKCX0KCWVjaG8gIiRtb250aCDQvNC10YHRj9GG0LXQsiDQstGL0L/Qu9Cw0YfQuNCy0LDQuyI7Ci8vIHlvdXIgY29kZSBnb2VzIGhlcmU=