#include<stdio.h>
int s[20][20][20] = {0};
int main() {
	int w, x, h, q, i, g = 0, j, k, n;
	int a, b, c, d, e, f;
	scanf("%d%d%d%d", &w, &x, &h, &q);
	for (j = 0; j < q; j++) {
		scanf("%d%d%d%d%d%d", &a, &b, &c, &d, &e, &f);
		for (i = a; i <= d; i++) {
			for (k = b; k <= e; k++) {
				for (n = c; n <= f; n++) {
					s[i][k][n] = 1;
				}
			}
		}
	}
	for (i = 1; i <= w; i++) {
		for (k = 0; k < x; k++) {
			for (n = 0; n < h; n++) {
				if (s[i][k][n] == 0)
					g++;

				
			}
		}
	}
	printf("%d", g);
	return 0;
}