#include <bits/stdc++.h>
using namespace std;
int n;
int main() {
    cin>>n;
    for (int a=1;a<=9;a++) {
        for (int b=0;b<=9;b++) {
            int c=100*a+10*b+n-a*a-b*b;
            if (c>=0&&c<10) {
                cout <<100*a+10*b+c << endl;
                return 0;
            }
        }
    }
    cout <<"cu gia ko co tuoi :))";
    return 0;
}