program Project2;

{$APPTYPE CONSOLE}

uses
  math;

var cl, c2, c3, s, h,d1,d2,n:int64;

begin

readln(n);

cl:=trunc(power(n,1/3)+0.5);
c2:=trunc(sqrt(n/cl)+0.5);
c3:=trunc(n/(cl*c2)) ;
S:=3*cl*c2*c3+2*(cl*c2+cl*c3+c2*c3)+ (cl+c2+c3);
h:=n-cl*c2*c3;
if h<>0 then begin

d1:=trunc(power(h,1/2)+0.5);
if d1*d1>h then dec(d1); d2:=trunc(h/d1) ;
s:=s+3*d1*d2+2*(d1+d2)+1 ;
h:=h-d1*d2;

if h<>0 then s:=s+3*h+2; end;

writeln (s);
readln;
end.