#include <iostream>
using namespace std;

int main()
{
    int k;
    cout << "vyvedete k : ";
    cin >> k;
    int len = 1;
    while (k != 0)
    {
        len *= 10;
        k--;
    }
    bool flag;
    for (int i = 0; i < len; i++)
    {
        int c = i*i;
        if (c > len / 10 && c < len)
        {
            while(c != 0)
            {
                 flag = true;
                if(c % 2 == 0)
                {
                     c /= 10;
                }
                else
                {
                    flag = false;
                    break;
                }
            }
            if(flag) cout << i*i << endl;
        }
    }
    return 0;
}