#include <iostream>

using namespace std;

int main()
{
  int n;
  cin>>n;

  for(int i=1;i<n;i++){
    int x = i;
    int sum = 0;
    while(x != 0){
        sum+= x %10;
        x = x / 10;
    }
    if(i == sum*sum){
        cout <<i<<endl;
    }
  }
    return 0;
}