1 import java.util.Scanner; 2  3 public class P1014 4 { 5     public static void main(String args[]) 6     { 7         try (Scanner cin = new Scanner(System.in)) 8         { 9             while (cin.hasNext())10             {11                 int n = cin.nextInt();12                 StringBuilder builder = new StringBuilder();13                 if (n == 0)14                     System.out.println(10);15                 else if (n == 1)16                     System.out.println(1);17                 else18                 {19                     for (int k = 9; k >= 2; k--)20                         while (n % k == 0)21                         {22                             n /= k;23                             builder.append(k);24                         }25                     if (n == 1)26                         System.out.println(builder.reverse());27                     else28                         System.out.println(-1);29                 }30             }31         }32     }33 }