sub bowlscore 
 {
   my $t;
   $_=join(',',@_);
   while(s/X,X,X/30,X,X/){}
   s!X,X,(\d)!20+$1.",X,$1"!eg;
   s!X,(\d),(\d)!10+$1+$2.",$1,$2"!eg;
   s!X,\d,/!20,1,/!g;
   s!\d,/,(\d)(\b)!10+$1.",$1$2"!eg;
   s!\d,/(?=,\d\d)!20!g;
   s!(\d\d)(,\d){1,2}$!$1!;
   map($t+=$_,split(/,/));
   $t;
 }