#!perl -lp $e=($c=$p=$i=/ /)-($'/$`)**2;$c-=1/$i*($p*=($i++/$i++)**2*$e)for 0..$$;$_=0|.5+6.28318*$`*$c
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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