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#!/usr/bin/env perl
use strict;
use warnings;
use feature 'say';
use DDP { deparse => 1 };
chomp(my $i = <STDIN>);
say get_fact($i);
sub get_fact{
my $i = shift;
if ($i != 1){
return get_fact($i - 1) * $i;
} else {
return 1;
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