#include <iostream>
 
using namespace std;
 
string ilo(int n)
{
  int liczba[10] = {};
  for (int i = 9; i >= 2; i--)
  {
    while (n % i == 0)
    {
      liczba[i]++;
      n /= i;
    }
  }
  if (n > 1)
  {
    return "NIE DA SIE!";
  }
  string ret;
  for (int i = 2; i <= 9; i++)
  {
    while (liczba[i]--)
    {
      ret += i + '0';
    }
  }
  return ret.empty() ? "0" : ret;
}
 
int main()
{
  int x;
  cin >> x;
  cout << ilo(x) << endl;
  return 0;
}

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