#include<iostream>
using namespace std;
int main() {
	int arr[21][21][21] = {1};
	int w, x, h, q;
	int x1, y1, z1, x2, y2, z2;
	cin >> w >> x >> h;
	cin >> q;
	for (int i = 0; i < q; i++)
	{
		cin >> x1 >> y1 >> z1 >> x2 >> y2 >> z2;
		for(int j = x1;j<=x2;j++)
			for(int k = y1;k<=y2;k++)
				for (int g = z1; g <= z2; g++)
				{
					arr[j][k][g] = 0;
				}
	}
	int cnt = 0;
	for(int j = 1;j<=w;j++)
		for(int k = 1;k<=x;k++)
			for (int g = 1; g <= h; g++)
			{
				if (arr[j][k][g] == 1)
				{
					cnt++;
				}

			}
	cout << cnt;
	return 0;




}