#include <iostream>
#include <cmath>
#include <vector>
#include <algorithm>

using namespace std;

int main(int argc, char** argv){
    long long int n;
    cin>>n;
    vector<char> v;
    if(n == 1){
        cout<<1;
        return 0;
    }
    else if(n == 0){
        cout<<10;
        return 0;
    }
    int cur = 9;
    while(n!=1){
        bool flag = false;
        for(; cur>=2; --cur){
             if(n/cur*cur==n){
                flag = true;
                v.push_back(cur);
                n = n/cur;
                cur = 9;
            }
        }
        if(!flag){
            cout<<-1;
            return 0;
        }
    }
    sort(v.begin(), v.end());
    long long int a = 0;
    for(int i = 0; i<v.size(); i++){
        a = a*10 + v.at(i);
    }
    cout<<a;
}