package timus;

import java.util.ArrayList;

import java.util.List;

import java.util.Scanner;

/**

* Created by sherxon on 12/3/16.

*/

public class ProductofDigits1014 {

public static void main(String[] args) {

Scanner in =new Scanner(System.in);

int n=in.nextInt();

if(n==0) System.out.println(10);

else{

List<Integer> set= new ArrayList<>();

getDivisors(n, set);

if(set.isEmpty()) System.out.println(-1);

else set.stream().sorted().forEach(System.out::print);

}

}

private static void getDivisors(int n, List<Integer> set) {

if(n<10){

set.add(n);

}else{

boolean t=false;

for (int i = 9; i >1 ; i--) {

if(n%i==0) {

t=true;

set.add(i);

getDivisors(n/i, set);

break;

}

}

if(!t){

set.clear();

}

}

}

}