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

#define int long long

int d[37];

int solve(int h, int w, int i) {
    if (h == 0 || w == 0) {
        return 0;
    }
    return (h / d[i]) * (w / d[i]) + solve(h % d[i], w % d[i], i - 1) + solve((h / d[i]) * d[i], w % d[i], i - 1) + solve(h % d[i], (w / d[i]) * d[i], i - 1);
}

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    
    int h, w;
    cin >> h >> w;

    int n;
    cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> d[i];
    }

    if (h % d[0] != 0 || w % d[0] != 0) {
        cout << -1;
        return 0;
    }

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