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#include <bits/stdc++.h>

using namespace std;

int main(){

    uint64_t h, w, size, count = 0;
    cin>>h>>w;

    size = h * w;

    int n;
    cin>>n;

    uint64_t obr[30];

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

    for(int i = n - 1; i >= 0; i--){
        int tmp = size / obr[i];
        size -= obr[i] * tmp;
        count += tmp;
    }

    if(size == 0)
        cout<<count;
    else
        cout<<-1;


    return 0;

}