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  1. or download this
    my $hash_w = { w => 100 };
my $hash_x = { x => 200 };
my $hash_y = {};   # no value, but in other cases it can have one
my $hash_z = { z => 300 };
  2. or download this
    300 # from z
  3. or download this
    my $w = values %$hash_w; 
my $x = values %$hash_x; 
...

my $max_val = (sort @all)[0];