No need to bother with indexes...

#!/usr/bin/perl

use strict; # https://perlmonks.org/?node_id=11121442
use warnings;

my @data = qw( 1 2 3 4 5 6 7 8 9 8 7 6 5 4 3 2 1 );
my $target = 5;

my $want = 0;
for ( @data )
  {
  $want-- > 0 and print "$_\n";
  $_ == $target and $want = 3;
  }
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