#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int main(int argc, char* argv[]) {
	int w, x, h,s;
	int x1, y1, z1, x2, y2, z2;
	int q;
	int l, e, p;
	scanf("%d%d%d", &w, &x, &h);
	scanf("%d", &q);
	while (q--) {
		scanf("%d%d%d%d%d%d", &x1, &y1, &z1, &x2, &y2, &z2);
	}
	l = x2-x1 + 1;
	l = abs(l);
	e = y2 - y1 + 1;
	e = abs(e);
	p = z2 - z1 + 1;
	p = abs(p);
	s = w * x * h - l * e * p;
	printf("%d\n", s);

	return 0;
}