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#include <bits/stdc++.h>
using namespace std;
long long x , y , n , a , b , px , py , w;
long long tab[35];
int main()
{
ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);
cin >> x >> y >> n;
for(int i = 1 ; i <= n ; i ++)
{
    cin >> tab[i];
}
for(int i = n ; i >= 1 ; i --)
{
    px = (x - a) / tab[i];
    py = (y - b) / tab[i];
    w += px * b / tab[i] + py * a / tab[i] + px * py; 
    a += px * tab[i];
    b += py * tab[i];
    //cout << px << " " << py << " " << a << " " << b << " " << w << "\n";
}
if(a == x && b == y)
    cout << w;
else
    cout << -1;


return 0;
}