or, as a simplification & TIMTOWTDI:

perl -E "my $foo = (0x0f-0x0e); say $foo;"
1

perl -E "my $foo = (0x10f-0x0e); say $foo;"
257

perl -E "my $foo = (0x10f-0x01); say $foo;"
270
[download]

Where the remaining conversion is left as an exercise to the author of the ill-formatted, gimmé question which I have downvoted for laziness (of a non-Perlish character) and failure to read the directions on formatting.

This section of the Monastery is known as is "Seekers of Perl Wisdom" ...not "Spare me the need to think or to read documentation, tuts, etc." SMTNTTOTRD,T,E is a very unwieldy and ugly title... and not what this site is about.

In addition to following toolic's fine suggestion about honoring the local markup scheme, you may wish to read On asking for help and How do I post a question effectively?.