1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
#include <iostream>
#include <vector>

using namespace std;

int main() {

	long width, height;
	int n;
	
	cin >> width >> height >> n;

	long* sizes = new long[n];
	for (int i = 0; i < n; i++) {
		cin >> sizes[i];
	}

    unsigned long long result = 0;

	for (int i = n - 1; i >= 0; i--) {
		long tempWidth = width;

		if (sizes[i] > height) {
			continue;
		}
		for (int j = i; j >= 0; j--) {
			if (sizes[j] > tempWidth) {
				continue;
			}
			long tempHeight = j == i ? height : (height / sizes[i]) * sizes[i];

			unsigned long long widthCount = tempWidth / sizes[j];
			unsigned long long heightCount = tempHeight / sizes[j];

			tempWidth = tempWidth % sizes[j];

			result += widthCount * heightCount;
		}

		if (tempWidth > 0) {
			cout << -1;
			return 0;
		}

		height = height % sizes[i];
	}

	if (height > 0) {
		cout << -1;
		return 0;
	}

	cout << result;

	return 0;
}