def main():
    n, k = map(int, input().split())

    if n % 2 == 1:
        n += 1

    if n // 2 >= k:
        print("YES")
    else:
        print("NO")


if __name__ == "__main__":
    main() def main():
    n, k = map(int, input().split())

    if n % 2 == 1:
        n += 1

    if n // 2 >= k:
        print("YES")
    else:
        print("NO") main n, k = map(int, input().split()) n map(int, input().split()) map int input().split() ().split () input split k if n % 2 == 1:
        n += 1

     n % 2 == 1 n % 2 n 2 1 n += 1 n 1 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 __name__ == "__main__":
    main() __name__ == "__main__" __name__ "__main__" main() main def main():
    n, k = map(int, input().split())

    if n % 2 == 1:
        n += 1

    if n // 2 >= k:
        print("YES")
    else:
        print("NO") def main():
    n, k = map(int, input().split())

    if n % 2 == 1:
        n += 1

    if n // 2 >= k:
        print("YES")
    else:
        print("NO") main
def main():
    n, k = map(int, input().split())

    if n % 2 == 1:
        n += 1

    if n // 2 >= k:
        print("YES")
    else:
        print("NO")


if __name__ == "__main__":
    main()
