N=int(input())
import math
I=int(True)
num=[I,I]
z=math.log(I,len(num))
need=int(math.sqrt(N))
for a in range(need):
	if N%len(num)==z:
		ans="NO"
		break
	else:
		ans="YES"
	num.append(I)
if N==I:
	ans="NO"
print(ans)