# I hate Math!!!
import math
N=int(raw_input())
cnt=0
p=1
while True:
    #print p
    if p*p > N:
        break
    while cnt<2 and N%p==0:
        cnt+=1
        N/=p
    if cnt >= 2:
        break
    p+=1
if cnt>=2:
    print "YES"
else:
    print"NO"