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

int main() {
    string S;
    cin >> S;
    int s = stoi(S);
    for(int i = 0; i <= 1000000; i++) {
        if(1ll*i*i%1000000 == s) {
            cout << "YES" << endl;
            return 0;
        }
    }
    cout << "NO" << endl;
}