$_=pop;$l^$_?$l=$_:die"$_\n"while$_=($_+$ARGV[0]/$_)/2 #### $_=pop;$l^$_?$l=$_:die"$_\n"while($_+=$ARGV[0]/$_)/=2 #### $_=pop;$l^$_?$l=$_:die$_,$/while($_+=$ARGV[0]/$_)/=2