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  1. or download this
    @_=map(1/$_,map($_**2,1..1000000));for(@_){$s+=$_[$i++]}$s*=6;print sq
    +rt$s;
    
  2. or download this
    @_=map(1/$_,map($_**2,1..1000000));for(@_){$s+=$_[$i++]}print sqrt$s*6