defmodule Main do
  def main do
    [n, m] = IO.read(:line) |> String.trim() |> String.split(" ") |> Enum.map(&String.to_integer/1)

    nm = for i <- 0..(m - 1) do
      IO.read(:line) |> String.trim() |> String.split(" ") |> Enum.map(&String.to_integer/1)
    end
    
    solve(n, m, nm) |> IO.puts
  end
  
  def solve(n, m, matrix) when 1 <= n
    and 0 <= m and m <= 100_000
    and is_list(matrix)
  do
    matrix
    |> Enum.reduce({true, {0, 0}}, fn
      [ti, pi], {true, {ct, cp}} ->
        dt = ti - ct
        dp = abs(cp - pi)
        if dp <= dt and pi < n do
          {true, {ti, pi}}
        else
          false
        end
      _, false ->
        false
    end)
    |> (fn
      false ->
        "No"
      {true, _} ->
        "Yes"
    end).()
  end

  def solve(_n, _m, _matrix), do: "No"
  
end