N=int(input())
c=0
if N:
    while N&1==0:
        N=N>>1 
        c+=1
        if c>2:break
    for i in range(3,int(N**.5)+1,2):
        while N%i==0:
            N//=i
            c+=1
            if c>2:break
c+=(N!=1)
print(["NO","YES"][c>2])