use strict;
use warnings;

my $verbose = 0;

my ($n, $k) = split /[ \n]/, <>;

$n -= $k;

print "n : $n\n" if ($verbose);

my @list = &fact($n);
print join ", ", @list, "\n" if ($verbose);
print $#list + 2, "\n"; # 0始まりのため+1、当該数値自身も一つなので+1

####
sub fact {
    my $arg = shift;
    for my $i (2 .. $arg - 1) {
	if ($arg % $i == 0) {
	    return $i, &fact($arg / $i);
	}
    }
    return $arg;
}