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<?php $a=fgetcsv(STDIN);$x=1;while(++$i<=$a[1])$x=$x*($a[0]-$i+1)/$i;echo $x?>
<?$a=fgetcsv(STDIN);$x=1;while($a[1]-$i)$x=$x*($a[0]-++$i+1)/$i;echo$x;
