a, b = map(int, input().split())
if (a % 2 == 0 and b <= a // 2) or (a % 2 == 1 and b <= (a + 1) // 2):
  print("YES")
else:
  print("NO") a, b = map(int, input().split()) a map(int, input().split()) map int input().split() ().split () input split b if (a % 2 == 0 and b <= a // 2) or (a % 2 == 1 and b <= (a + 1) // 2):
  print("YES")
else:
  print("NO") (a % 2 == 0 and b <= a // 2) or (a % 2 == 1 and b <= (a + 1) // 2) a % 2 == 0 and b <= a // 2 a % 2 == 0 a % 2 a 2 0 b <= a // 2 b a // 2 a 2 a % 2 == 1 and b <= (a + 1) // 2 a % 2 == 1 a % 2 a 2 1 b <= (a + 1) // 2 b (a + 1) // 2 a + 1 a 1 2 print("YES") print "YES" print("NO") print "NO" a, b = map(int, input().split()) map(int, input().split()) a b = map(int, input().split()) map(int, input().split()) b
a, b = map(int, input().split())
if (a % 2 == 0 and b <= a // 2) or (a % 2 == 1 and b <= (a + 1) // 2):
  print("YES")
else:
  print("NO")