#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    double k=sqrt(n);
    if(k==int (k/1)){
        cout<<"Y";
    }
    else{
        cout<<"N";
    }
}
/**************************************************************
	Problem: 2118
	User: luyanchen
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/