program persegibintang1;
var a,b,c : integer;

begin
 readln(a);
 for b:= 1 to a do
  begin
   for c := 1 to a do
    begin
     if((b=1) or (b=a) or (c=1) or (c=a)) then
      write('*')
     else
      write(' ');
     end;
    writeln;
    end;
  readln;
end.