#include <stdio.h>

int main() {
	int w = 0, x = 0, h = 0;  int count = 0;
	int x1 = 0, y1 = 0, z1 = 0, x2 = 0, y2 = 0, z2 = 0; int a[21][21][21] = { 0 };
	scanf("%d %d %d\n", &w, &x, &h); int q = 0;
	scanf("%d\n", &q); for (int i = 1; i <= q; i++) {
		scanf("%d %d %d %d %d %d", &x1, &y1, &z1, &x2, &y2, &z2); 
	}for (int i = x1; i <= x2; i++) {
		for (int j = y1; j <= y2; j++) {
			for (int k = z1; k <= z2; k++) {
				a[i][j][k] = 1;
			}
		}
	} for (int i = 1; i <=w; i++) {
		for (int j = 1; j <= x; j++) {
			for (int k = 1; k <=h; k++) {
				if (a[i][j][k] == 0)count++;
			}
		}
	}
	printf("%d\n",count);
	return 0;
}