n, m = read_line.split.map &.to_i
cnt = [0] * (m.succ // 2)
n.times do
  l, r = read_line.split.map &.to_i
  (l..r).each do |i|
    cnt[i < cnt.size ? i : cnt.size - i - 1 - m % 2] += 1
  end
end
puts cnt.each_with_index.all? { |(v, i)|
  if m.odd? && i != m//2
    v <= 1
  else
    v <= 2
  end
} ? "YES" : "NO"