#include <stdio.h>

int find_min_K(int M)
{
   if (M < 10)
   {
      return M;
   }

   int K = 0;
   int factor = 9;
   int multiplier = 1;

   while (M > 1 && factor > 1)
   {
      if (M % factor == 0)
      {
         K += factor * multiplier;
         M /= factor;
         multiplier *= 10;
      }
      else
      {
         factor--;
      }
   }

   if (M != 1)
   {
      return -1; 
   }

   return K;
}

int main()
{
   int M;
   scanf("%d", &M);
   int K = find_min_K(M);
   printf("%d", K);

   return 0;
}