#include <iostream>
#include <cstdio>
using namespace std;
bool v[21][21][21];
int main() {
	int w, x, h, q, x1, y1, z1, x2, y2, z2, cnt = 0;
	scanf("%d%d%d%d", &w, &x, &h, &q);
	for (int i = 1; i <= w; i++)
			for (int j = 1; j <= x; j++)
				for (int k = 1; k <= h; k++)
					v[i][j][k] = true;
	while (q--) {
		scanf("%d%d%d%d%d%d", &x1, &y1, &y1, &x2, &y2, &z2);
		for (int i = x1; i <= x2; i++)
			for (int j = y1; j <= y2; j++)
				for (int k = z1; k <= z2; k++)
					v[i][j][k] = false;
	}
	for (int i = 1; i <= w; i++)
			for (int j = 1; j <= x; j++)
				for (int k = 1; k <= h; k++)
					if (v[i][j][k])
						cnt++;
	printf("%d\n", cnt);
	return 0;
}