import sys
sys.setrecursionlimit(5*10**5)
input = sys.stdin.readline
from collections import defaultdict, deque, Counter
from heapq import heappop, heappush
from bisect import bisect_left, bisect_right
from math import gcd

s = int(input())


for i in range(10**6):
  if i ** 2 % (10**6) == s:
    print("YES")
    break
else:
  print("NO")