require "config_file";
$this_num=$number_from_config_file;
$that_num=$this_num;
if ($this_num == $that_num)
{
    $that_num=0;
}
elsif ($this_num != $that_num)
{
    $that_num=0;
}
#ignore this_num for the rest of the script's life.

##</code><code>##

$this_var = $in{"this_var"};
$that_var = $in{"that_var"};
$some_other_var = $in{"some_other_var"};
$foo = $in{"foo"};
$bar = $in{"bar"};
$baz = $in{"baz"};
.
.
.