## https://yukicoder.me/problems/no/3493



def main():
    N, P = map(int, input().split())
    if N == 0:
        print("No")
        return
    elif N % 2 == 1:
        print("Yes")
        return 
    
    if (N + 1) % P == 0:
        print("Yes")
        return
    
    if (N + 1) % (P - 1) == 0:
        print("Yes")
        return

    n = (N + 1) % (P - 1)
    if (P - 1) % n == 0:
        print("Yes")
    else:
        print("No")
    






if __name__ == "__main__":
    main()