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sub p{
%p=@_=3..1+pop;@p{2,map$f*$_,@_}=$f=$_ for@_;grep$p{$_},2,@_
}

sub p{
2,grep{$f=$_,@p{map$f*$_,3..$_[0]/$f}=0if$p{$_}}%p=3..1+$_[0]
}