import sys

readline = sys.stdin.readline
MOD = 10 ** 9 + 7
INF = float('INF')
sys.setrecursionlimit(10 ** 5)


def main():
    N, K = map(int, readline().split())

    cnt = (N + 1) // 2

    if cnt >= K:
        print("YES")
    else:
        print("NO")


if __name__ == '__main__':
    main() import sys sys readline = sys.stdin.readline readline sys.stdin.readline sys.stdin sys stdin readline MOD = 10 ** 9 + 7 MOD 10 ** 9 + 7 10 ** 9 10 9 7 INF = float('INF') INF float('INF') float 'INF' sys.setrecursionlimit(10 ** 5) sys.setrecursionlimit sys setrecursionlimit 10 ** 5 10 5 def main():
    N, K = map(int, readline().split())

    cnt = (N + 1) // 2

    if cnt >= K:
        print("YES")
    else:
        print("NO") main N, K = map(int, readline().split()) N map(int, readline().split()) map int readline().split() ().split () readline split K cnt = (N + 1) // 2 cnt (N + 1) // 2 N + 1 N 1 2 if cnt >= K:
        print("YES")
    else:
        print("NO") cnt >= K cnt K print("YES") print "YES" print("NO") print "NO" if __name__ == '__main__':
    main() __name__ == '__main__' __name__ '__main__' main() main readline = sys.stdin.readline sys.stdin.readline readline MOD = 10 ** 9 + 7 10 ** 9 + 7 MOD INF = float('INF') float('INF') INF def main():
    N, K = map(int, readline().split())

    cnt = (N + 1) // 2

    if cnt >= K:
        print("YES")
    else:
        print("NO") def main():
    N, K = map(int, readline().split())

    cnt = (N + 1) // 2

    if cnt >= K:
        print("YES")
    else:
        print("NO") main
import sys

readline = sys.stdin.readline
MOD = 10 ** 9 + 7
INF = float('INF')
sys.setrecursionlimit(10 ** 5)


def main():
    N, K = map(int, readline().split())

    cnt = (N + 1) // 2

    if cnt >= K:
        print("YES")
    else:
        print("NO")


if __name__ == '__main__':
    main()
