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#include <bits/stdc++.h>

using namespace std;

unsigned long long d[300];

bool spr;

unsigned long long solve(const int &n, const unsigned long long & h,const unsigned long long &w){
	unsigned long long result = 0;
	unsigned long long m1, m2;
	if(h == 0 || w == 0){
		return 0;
	}
	if(h < d[0] || w < d[0]){
		spr = false;
		return 0;
	}
	for(int i = n - 1; i >= 0; --i){
		if(d[i] <= h && d[i] <= w){
			m1 = (h / d[i]);
			m2 = (w / d[i]);
			result += m1 * m2;
			result += solve(n, m1 * d[i], w - m2 * d[i]);
			result += solve(n, h - m1 * d[i], m2 * d[i]);
			result += solve(n, h - m1 * d[i], w - m2 * d[i]);
			break;
		}
	}
		return result;
}

int main(){
	std::ios_base::sync_with_stdio(false);
	std::cout.tie(nullptr);
	std::cin.tie(nullptr);
	
	int n;
	unsigned long long	h, w, result;
	cin >> h >> w;
	cin >> n;
	
	spr = true;
	
	for(int i = 0; i < n; ++i){
		cin >> d[i];
	}
	
	result = solve(n, h, w);
	
	if(spr){
		cout << result << '\n';
	}
	else{
		cout << "-1\n";
	}
	
	return 0;
}