let () =
  Scanf.scanf "%d %d\n" @@ fun n m ->
  let lst = List.fast_sort compare 
      (Array.to_list (Array.init m @@ fun _ -> 
          Scanf.scanf "%d %d\n" @@ fun t p -> (t, p))) in
  let (ans,(_,_)) =
    List.fold_left (fun (ans,(bfrt,bfrp)) (t,p) -> 
        if abs (bfrp-p) <= t - bfrt then (true,(t,p))
        else (false,(t,p))) (true,(0,0)) lst in
  Printf.printf "%s\n" (if ans then "Yes" else "No")