def main():
    n, k = map(int, input().split())
    if n >= 2*k-1:
        print("YES")
    else:
        print("NO")

if __name__ == "__main__":
    main() def main():
    n, k = map(int, input().split())
    if n >= 2*k-1:
        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*k-1:
        print("YES")
    else:
        print("NO") n >= 2*k-1 n 2*k-1 2*k 2 k 1 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*k-1:
        print("YES")
    else:
        print("NO") def main():
    n, k = map(int, input().split())
    if n >= 2*k-1:
        print("YES")
    else:
        print("NO") main
def main():
    n, k = map(int, input().split())
    if n >= 2*k-1:
        print("YES")
    else:
        print("NO")

if __name__ == "__main__":
    main()