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#include<bits/stdc++.h>
using namespace std;
int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	long long n,h,w,zh,zw,wyn;
	vector<long long>d;
	cin>>h>>w;
	cin>>n;
	for(int i=0;i<n;++i){
		cin>>zh;
		d.emplace_back(zh);
	}
	if(h%d[0]||w%d[0]){cout<<-1;return 0;}
	wyn=(h/d.back())*(w/d.back());
	zh=h%d.back();zw=w%d.back();
	d.pop_back();
	while(d.size()){
		wyn+=((h-zh)/d.back())*(zw/d.back());
		wyn+=(zh/d.back())*((w-zw)/d.back());
		wyn+=(zh/d.back())*(zw/d.back());
		zh=zh%d.back();zw=zw%d.back();
		d.pop_back();
	}
	cout<<wyn;
}