void decentNumber(int n) {
    for (auto i = 0; i <= n; ++i) {
        if (i % 5 == 0 && (n - i) % 3 == 0) {
            cout << string(n - i, '5') << string(i, '3') << endl;
            return;
        }
    }
    cout << -1 << endl;
}