USING: io kernel math math.parser ;
readln string>number
dup ( x -- x x )
dup ( x -- x x )
*
3
*
-
number>string print
ClVTSU5HOiBpbyBrZXJuZWwgbWF0aCBtYXRoLnBhcnNlciA7CgpyZWFkbG4gc3RyaW5nPm51bWJlcgoKZHVwICggeCAtLSB4IHggKQpkdXAgKCB4IC0tIHggeCApCioKMwoqCi0KCm51bWJlcj5zdHJpbmcgcHJpbnQ=