var
  x,y:longint;
begin
  readln(x);
  while not eof do
    begin
      readln(x,y);
      if (x=y) or (x=y+2) then
        begin
          if odd(x) then
            writeln(x+y-1)
          else
            writeln(x+y);
        end
      else
        writeln('No Number');
    end;
end.