#include <iostream>
using namespace std;
int s[25][25][25];
int main() {
    int w, x, h; cin >> w >> x >> h;
    for (int i = 1; i <=h; i++) {
        for (int j = 1; j <= w; j++) {
            for (int k = 1; k <= x; k++) {
                s[k][j][i] = 1;
            }
        }
    }
    int n; cin >> n; int a, b, c, e, f, g;
    for (int i = n; i > 0; i--) {
        cin >> a >> b >> c >> e >> f >> g;
        for (int j = c; j <= g; j++) {
            for (int k = b; k <= f;k++) {
                for (int l= a; l <= e;l++) {
                    s[l][k][j]=0;
                }
            }
        }
    }

    int sum = 0;
    for (int i = 1; i <= h; i++) {
        for (int j = 1; j <= w; j++) {
            for (int k = 1; k <= x; k++) {
                if (s[k][j][i] == 1)  sum++; 
            }
        }
    }

    cout << sum;
    return 0;
}