area of triangle by primo

<?for(;fscanf(STDIN,~\xda\x9b\xda\x9b\xda\x9b,$a,$b,$c);)echo-~sqrt(pow($a*$a-$b*$b+$c*=$c,2)/-4+$a*$a*$c)>>1,~\xf5;

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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