1014

// OK greedy Timus 1014 https://acm.timus.ru/problem.aspx?space=1&num=1014

# include <iostream>
# include <vector>
using namespace std;

int main() {
    int32_t q;
    cin >> q;
    if (q == 1) {
        cout << 1;
        return 0;
    }
    if (q == 0) {
        cout << 10;
        return 0;
    }
    vector<int32_t> res(10, 0);
    for (int32_t i = 9; i > 1 && q != 1; i--) {
        while (q % i == 0) {
            res[i]++;
            q /= i;
        }
    }
    if (q != 1) {
        cout << -1;
    }
    else {
        for (size_t i = 1; i < 10; i++) {
            for (size_t j = 0; j < res[i]; j++) {
                cout << i;
            }
        }
    }
    return 0;
}