#include <iostream>

using namespace std;

int main()
{
	int w, x, h;
	int q;
	int x1, y1, z1, x2, y2, z2;
	cin >> w >> x >> h;
	cin >> q;
	int a[w][x][h];
	for (int n = 0;n < q;n ++)
	{
		cin >> x1 >> y1 >> z1 >> x2 >> y2 >> z2;
		for (int i = 0;i < w;i ++)
		{
			for (int j = 0;j < x;j ++)
			{
				for (int k = 0;k < h;k ++)
				{
					if (x1 <= i && x2 >= i && y1 <= j && y2 >= j && z1 <= k && z2 >= k) a[i][j][k] = 1;
					else a[i][j][k] = 0;
				}
			}
		}
	}
	int cnt = 0;
	for (int i = 0;i < w;i ++)
	{
		for (int j = 0;j < x;j ++)
		{
			for (int k = 0;k < h;k ++)
			{
				if (a[i][j][k] == 1)
				{
					cnt ++;
				}
			}
		}
	}
	int res = w * x * h - cnt;
	cout << res;
	return 0;
}