#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a;
	cin>>a;
	double c;
	c=sqrt(a);
	int b;
	b=int(c);
	if(b<c)
	{
		cout<<"N";
	}
	else
	{
	    cout<<"Y";	
	}	
	return 0;
}
/**************************************************************
	Problem: 2118
	User: chenkexin
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/