xuy

program pchprr;
var
a,b,c,D,x1,x2:real;


begin
readln(a,b,c);
if(a=0)and(b=0)and(c=0) then writeln('∞')

else
   begin
   if(a>=0) then
   begin
   D:=sqr(b)-4*a*c;

   if(D>=0) then
      begin
      x1:=(b*-1 + sqrt(D))/2*a;
      writeln('x1=',x1);

      if(D<>0) then
         begin
         x2:=(b*-1 - sqrt(D))/2*a;
         writeln('x2=',x2);
         end;
      end

   else
      begin
      writeln('no');
      end;
   end

else
   begin
   x1:=(c*-1)/b;
   writeln('x=',x1);
   end;

   end;

end.