n = int(input())
f = True
s = True
p = True
if not(True ^ n):
    print("NO")
    exit()
for i in range(n):
    if f:
       f = False
       continue
    if s:
        s = False
        continue
    if p and not(n % i) and n != i:
        p = False
if p:
    print("YES")
else:
    print("NO")