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#include <bits/stdc++.h>
#define pb push_back
#define inf 999999999
#define int long long
#define turbo ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

using namespace std;

vector<int> squares;

signed main()
{
    turbo;
    int h, w;
    cin >> h >> w;
    int t;
    cin >> t;
    for (int i = 0; i < t; i++)
    {
        int x;
        cin >> x;
        squares.pb(x);
    }
    if (h % squares[0] != 0 || w % squares[0] != 0) {
        cout << -1;
        return 0;
    }
    int wsquares = w / squares[0];
    int hsquares = h / squares[0];
    int ans = wsquares * hsquares;
    for (int i = 1; i < t; i++)
    {
        int scalar = squares[i] / squares[i - 1];
        int wsquares_new = wsquares / scalar;
        int hsquares_new = hsquares / scalar;
        if (wsquares_new == 0 || hsquares_new == 0) {
            break;
        }
        ans -= (wsquares_new * scalar) * (hsquares_new * scalar);
        ans += wsquares_new * hsquares_new;
        wsquares = wsquares_new;
        hsquares = hsquares_new;
    }
    cout << ans;
    return 0;
}