may=[2,3,5,7,13,17,19,31,61,89,107,127,521,607,1279,2203,2281,3217,4253,4423,9689,9941,11213,19937,21701,23209,44497,86243,110503,132049,216091,756839,859433,1257787,1398269] while True: try: n=int(input()) if 2**n-1 in may: print("yes") elif n==0: break else: print("no") except: break