import java.util.*;
import java.io.*;
import java.lang.String;

public class P1014{
public static void main(String[] args){
Scanner in=new  Scanner(System.in);
PrintWriter out=new PrintWriter(System.out);
long m=0;
int i=0;
String num;
try{
int n=in.nextInt();
 if(n==1)
      out.println("1");
 else
 if(n<10)
 out.println("1"+n);
  else
  {
      for(i=9;i>1;i--)
   {
   if(n%i==0)
  { n=n/i;
    m=m*10+i;
    i++;
 }}
 if(n!=1)
        out.print("-1");
 else{
 String s=Long.toString(m);
  for(i=s.length()-1;i>=0;i--)
  out.print(s.charAt(i));
  }}
}catch(Exception e){
  out.println(e);
   }
   out.flush();
}}
For C++ code and other queqtions write imran_yusubov@yahoo.com

Edited by author 10.09.2008 06:38