lim = 10 ** 7
flg = [0] * lim
flg[0] = 1
for i in range(lim):
  if flg[i]:
    continue
  while True:
    i = (i ** 2) % lim
    if flg[i]:
      break
    flg[i] = 1
s = int(input())
print("YES" if flg[s] else "NO")