with Ada.Text_IO; use Ada.Text_IO;
with Ada.Integer_Text_IO; use Ada.Integer_Text_IO;

procedure Solve is
   A : Integer;
   B : Integer;
   M : Integer;
begin
   Get (A);
   Get (B);
   M := A+B;
   if A-B > M then
      M := A-B;
   end if;
   if A*B > M then
      M := A*B;
   end if;
   Put_Line (Integer'Image (M));
end Solve;