#include <bits/stdc++.h>
using namespace std;
#define int long long
int32_t main(){
    string s;
    cin>>s;
    for(int i=1000;i<1000000;i++){
        int amari=i*i%1000000;
        if(amari==stoll(s)){
            cout<<"YES"<<endl;
            return 0;
        }
    }
    cout<<"NO"<<endl;
    return 0;
}