qazwsxedcrfvtgbyhnujmikolp

n=int(input())
tong=0
for i in range(1,int(n*0.5)+1):
if n%i==0:
if ii==n:
tong+=i
else:
tong+=i+n//i
if tong//2==n:
print('YES')
else:
print('NO')