BEGIN {
    my @levels = ( initiate => 1,
                   novice => 20,
                   acolyte => 50,
                   scribe => 100,
                   monk => 200,
                   friar => 500,
                   abbot => 1000,
                   bishop => 1600,
                   pontiff => 2300,
                   saint => 3000 );
    while ( @levels ) {
        my ( $level, $xp ) = splice @levels, 0, 2;
        eval "sub $level () { $xp }";
    }
}
$xp = 0 + shift;

printf
"XP = $xp
%0.2f initiates
%0.2f novices, %d to promotion
%0.2f acolytes, %d to promotion
%0.2f scribes, %d to promotion
%0.2f monks, %d to promotion
%0.2f friars, %d to promotion
%0.2f abbots, %d to promotion
%0.2f bishops, %d to promotion
%0.2f pontiffs, %d to promotion
%.02f saints, %d to promotion
",
$xp / initiate,
$xp / novice,  novice  - ( $xp % novice ),
$xp / acolyte, acolyte - ( $xp % acolyte ),
$xp / scribe,  scribe  - ( $xp % scribe ),
$xp / monk,    monk    - ( $xp % monk ),
$xp / friar,   friar   - ( $xp % friar ),
$xp / abbot,   abbot   - ( $xp % abbot ),
$xp / bishop,  bishop  - ( $xp % bishop ),
$xp / pontiff, pontiff - ( $xp % pontiff ),
$xp / saint,   saint   - ( $xp % saint );

# I wish this was lisp.
for ( qw( saint pontiff bishop abbot friar monk scribe acolyte novice initiate ) ) {
    eval "if ( \$xp >= $_ ) { push \@change, int( \$xp / $_ ) . \" ${_}s\";
                              \$xp %= $_ }";
}
for ( @change ) {
    if ( 1 == $_ ) {
        s/s$//;
    }
}

$_ = join( ', ', @change, ) . "\n";
# Replaced w/ NinthWave's code. No, I didn't read it first.
s<(?:^|\D)(1 [a-z]+(?:, 1 [a-z]+)*)>{
    my @ranks = $1 =~ /[a-z]+/g;
    " a " . join ', ', @ranks;
}ge;
s/^ //;
if ( /,.+,/ ) {
    s/(.+),([^,]+)/$1, and$2/;
}
print