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// clang-format off
#include <bits/stdc++.h>

using namespace std;

#define ALL(x) (x).begin(), (x).end()

template<class C> void mini(C &a5, C b5) { a5 = min(a5, b5); }
template<class C> void maxi(C &a5, C b5) { a5 = max(a5, b5); }

#ifdef LOCAL
const bool debug = true;
#else
const bool debug = false;
#define cerr if (true) {} else cout
#endif
// clang-format on

#define int long long
#define double long double

const int INF = 1e18;
const int mod = 1e9 + 7;

vector<int> v;

int solve(int w, int h, int i) {
    if (w <= 0 || h <= 0) {
        return 0;
    }
    if (i < 0) {
        cout << "-1\n";
        exit(0);
    }

    int ww = w / v[i];
    int hh = h / v[i];

    return ww * hh + solve(w - ww * v[i], h, i - 1) +
           solve(ww * v[i], h - hh * v[i], i - 1);
}

int32_t main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int w, h, n;
    cin >> w >> h >> n;
    for (int i = 0; i < n; i++) {
        int x;
        cin >> x;
        v.push_back(x);
    }

    cout << solve(w, h, n - 1) << '\n';

    return 0;
} /*

 */