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#include <bits/stdc++.h>
using namespace std;

int wymiary[35];
int h, w, n;

void wczyt() {
    cin >> h >> w >> n;
    for (int i = n-1; i >= 0; --i) {
        cin >> wymiary[i];
    }
}

int main() {

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    wczyt();
    int bok = min(h, w);
    vector<int> A;
    vector<int> B;
    int suma = 0;

    while (bok > 0) {
        if (bok<wymiary[n-1]) break;
        for (int i = 0; i < n; ++i) {
            if (bok >= wymiary[i]) {
                bok -= wymiary[i];
                A.push_back(wymiary[i]);
                suma += wymiary[i];
                break;
            }

        }
        //cout << "hihi\n";
    }
    if (suma != min(h, w)) {
        cout << "-1";
        return 0;
    }


    suma = 0;
    bok = max(w, h);
    while (bok > 0) {
        if (bok < wymiary[n - 1]) break;
        for (int i = 0; i < n; ++i) {
            if (bok >= wymiary[i]) {
                bok -= wymiary[i];
                B.push_back(wymiary[i]);
                suma += wymiary[i];
                break;
            }

        }
        //cout << "hihi\n";
    }
    if (suma != max(h, w)) {
        cout << "-1"; 
        return 0;
    }

    /*
    for (int i = 0; i < A.size(); ++i) {
        for (int j = 0; j < B.size(); ++j) {
            //cout << "max(A[i], B[i])=" << max(A[i], B[j]) << endl;
            //cout << "min(A[i], B[i])=" << min(A[i], B[j]) << endl;
            //cout << endl;
            cout << max(A[i], B[j]) / min(A[i], B[j]) << " \n\n";
        }
        cout << endl;
    }*/
    //cout << endl << endl;
    int wynik = 0;
    for (int i = 0; i < A.size(); ++i) {
        for (int j = 0; j < B.size(); ++j) {
            wynik += (max(A[i],B[j]) / min(A[i],B[j]));
        }
    }

    cout << wynik;
    /*
    // debug
    cout << "\n\n\n";
    cout << "bok: " << bok << "\n";
    cout << "wynik: " << wynik << "\n";

    for (int i = 0; i < n; ++i) {
        cout << wymiary[i] << "|";
    }
    cout << "\n wektor A" << endl;
    for (int i = 0; i < A.size(); ++i) {
        cout << A[i] << " ";
    }
    cout << "\n\n\n\n wektor B" << endl;
    for (int i = 0; i < B.size(); ++i) {
        cout << B[i] << " ";
    }
    */
    
    return 0;
}