#include <bits/stdc++.h>
using namespace std;

int main()
{
	string s;
	cin >> s;
	int64_t n = 0;
	for(int i = 0; i < 6; i++)
	{
		n *= 10;
		n += s[i] - '0';
	}
	const int64_t mod = 1000000;
	
	for(int64_t i = 1; i <= 1000000; i++)
	{
		if((i * i) % mod == n)
		{
			cout << "YES" << endl;
			return 0;
		}
	}
	cout << "NO" << endl;
	return 0;
}