#include<iostream>
#include<math.h>
#include<iomanip>
using namespace std;
bool isHws(int n);
typedef struct
{
	int x1, y1, z1,x2,y2,z2;
}pos;
int main()
{
	pos a[100];
	int w, x, h,q;
	cin >> w >> x >> h >> q;
	for (int i = 0; i < q; i++)
	{
		cin >> a[i].x1 >> a[i].y1 >> a[i].z1 >> a[i].x2 >> a[i].y2 >> a[i].z2;
	}
	int V = w * x * h;
	for (int i = 0; i < q; i++)
	{
		int tem = (1+a[i].x2 - a[i].x1) * (1+a[i].y2 - a[i].y1) * (1+a[i].z2 - a[i].z1);
		V -= tem;
	}
	cout << V << endl;
	return 0;
}