program fractii;
   var  n,p,q,i:longint;f,g:text;a:boolean;
   begin
   assign(f,'fractii.in');reset(f);
   assign(g,'fractii.out');rewrite(g);
   readln(f,n);
   for p:=1 to n do begin
   for q:=1 to n do begin
   for i:=2 to n-1 do begin
   if (p mod i=0)and(q mod i=0)then a:=true;end;
   if not a then write(g,p,'/',q,' '); a:=false;
   end;
   end;
   close(f);
   close(g);
      end.