n=int(input())
s=0
for i in range(1,n//2+1):
    if(n%i==0):
        s=s+i
if(s==n):
    print("yes")
else:
    print("no")
/**************************************************************
	Problem: 1859
	User: admin
	Language: Python
	Result: Accepted
	Time:2517 ms
	Memory:34244 kb
****************************************************************/