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  1. or download this
     10000000000000000000000 = 4194304
    -            10000000000 = 1024
    ---------------------------------------
      1111111111110000000000 = 4193280 <= This is the result we're looking
    + for!
    
  2. or download this
    
    #!/usr/bin/perl -w
    ...
      return (length($SUM)) ? $SUM : 0;
    }