n=int(input())

def  y(n):
    yaku=[]
    for i in range(2,int(n**0.5)+1):
        if n%i==0:
            yaku.append(i)
            if i == n//i:
                continue
            yaku.append(n//i)
    return yaku

t=y(n)

if len(t) == 0:
    print('NO')

else:
    for i in t:
        tt=y(n)
        if len(tt) > 0:
            print('YES')
            break   
    else:
        print('NO')