Just do it in a slightly more complicated manner than is strictly necessary...

#!/usr/bin/perl

use strict;
use warnings;
use feature qw/say/;

while(my $n = shift @ARGV) {
    say
        grep    {  $n == $_  }
        map     {  $n += $_  }
        map     {  $n--      }
        map     { ($n) x $_  }
                   $n

;}
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