#include <iostream>
#include <cstdio> 
using namespace std;
int w, x, h, q;
struct node{
    int w1, x1, h1;
    int w2, x2, h2;
}a[105];
int main() {
    cin >> w >> x >> h;
    cin >> q;
    for (int i = 1; i <= q; i++) {
        cin >> a[i].w1 >> a[i].x1 >> a[i].h1 >> a[i].w2 >> a[i].x2 >> a[i].h2;
    }
    int sum = w * x * h;
    for (int i = 1; i <= q; i++) {
        sum -= (a[i].x2 - a[i].x1 + 1) * (a[1].w2 - a[i].w1 + 1) * (a[i].h2 - a[i].h1 + 1);
    }
    cout << sum << endl;
    return 0;
}