#!/usr/bin/env perl

use strict;
use warnings;

my $n = <>; chomp $n;
my %h;
$h{1} = 1;
for (my $i = 2; $i < 50; $i++) {
  $h{$i} = ($h{$i - 1} * $i) % 1000000000000;
}

if ($n >= 50) {
  print "000000000000\n";
} else {
  printf("%d\n", $h{$n});
}