def divisors(X):
   assert X >= 1
   from math import isqrt
   head = [d for d in range(1, isqrt(X) + 1) if X%d == 0]
   tail = [X//d for d in reversed(head)]
   if isqrt(X)**2 == X:
      head.pop()
   return head + tail

N = int(input())
S = sum(divisors(N))
ans = S == N*2
if ans is True:
   print("Yes")
else:
   print("No")