# coding: utf-8
# Your code here!

def main():
    s=[0, 1, 4, 9, 16, 21, 24, 25, 29, 36, 41, 44, 49, 56, 61, 64, 69, 76, 81, 84, 89, 96]
    a=input()
    if int(a[len(a)-2:]) in s:
        print("YES")
    else:
        print("NO")
    
    
    
main()