n=int(input())
f = 1
for i in range(2,n-1,1):
    if n % i==0:
        f = 0
        break
if f==1:
    print("Yes")
else:
    print(i)

/**************************************************************
	Problem: 1061
	User: admin
	Language: Python
	Result: Accepted
	Time:90 ms
	Memory:34244 kb
****************************************************************/