N, K = map(int, input().split())
if N % 2 == 0:
  if N/2 >= K:
    print("YES")
  else:
    print("NO")
else:
  if (N + 1)/2 >= K:
    print("YES")
  else:
    print("NO") N, K = map(int, input().split()) N map(int, input().split()) map int input().split() ().split () input split K if N % 2 == 0:
  if N/2 >= K:
    print("YES")
  else:
    print("NO")
else:
  if (N + 1)/2 >= K:
    print("YES")
  else:
    print("NO") N % 2 == 0 N % 2 N 2 0 if N/2 >= K:
    print("YES")
  else:
    print("NO") N/2 >= K N/2 N 2 K print("YES") print "YES" print("NO") print "NO" if (N + 1)/2 >= K:
    print("YES")
  else:
    print("NO") (N + 1)/2 >= K (N + 1)/2 N + 1 N 1 2 K print("YES") print "YES" print("NO") print "NO" N, K = map(int, input().split()) map(int, input().split()) N K = map(int, input().split()) map(int, input().split()) K
N, K = map(int, input().split())
if N % 2 == 0:
  if N/2 >= K:
    print("YES")
  else:
    print("NO")
else:
  if (N + 1)/2 >= K:
    print("YES")
  else:
    print("NO")