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

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int h, w, n;
    cin >> h >> w >> n;
    vector<int> r (n, 0);
    for (int i = 0; i < n; i++) {
        cin >> r[i];
    }
    int s = 0;
    int x = 0, y = 0;
    for (int i = n-1; i >= 0; i--) {
        int a = (h-x)/r[i];
        s += a*(y/r[i]);
        x += a*r[i];
        a = (w-y)/r[i];
        s += a*(x/r[i]);
        y += a*r[i];

    }
    if (h != x || w != y) {
        cout << -1;
        return 0;
    }
    cout << s;
}