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

#define N 10000
int q;
int a[N][N][N], x1[N], y[N], z1[N], x2[N], y2[N], z2[N];
int w, x, h, sum = 0;

int main()
{
    scanf("%d%d%d", &w, &x, &h);
    scanf("%d", &q);
    for (int i = 0; i < q; i ++) scanf("%d%d%d%d%d%d", &x1[i], &y[i], &z1[i], &x2[i], &y2[i], &z2[i]);

    for(int f = 0; f < q; f ++)
    {
        for (int i = x1[f]; i <= x2[f]; i ++)
            for (int j = y[f]; j <= y2[f]; j ++)
                for (int k = z1[f]; k <= z2[f]; k ++)
                    sum ++;
    }

    printf("%d", w*x*h - sum);
    return 0;
}