#include <iostream>
#include <vector>
using namespace std;
int main(){
    int w, x, h, q, x_1, y_1, z_1, x_2, y_2, z_2, result = 0;
    cin>>w>>x>>h>>q;
    vector<vector<vector<bool>>> cube(w, vector<vector<bool>>(x, vector<bool>(h, 1)));
    for(int i = 0;i < q;i++){
        cin>>x_1>>y_1>>z_1>>x_2>>y_2>>z_2;
        for(int x = x_1;x <= x_2;x++){
            for(int y = y_1;y <= y_2;y++){
                for(int z = z_1;z <= z_2;z++){
                    cube[x][y][z] = 0;
                }
            }
        }
    }
    for(auto e: cube)for(auto l: e)for(auto m: l)result += m;
    cout<<result;
    return 0;
}