#include <stdio.h>
int main()
{
    int a,b,c;
    int v[21][21][21]={0};
    scanf("%d%d%d",&a,&b,&c);
    int i1,i2,i3;
    for(i1=1;i1<=a;i1++)
        for(i2=1;i2<=b;i2++)
            for(i3=1;i3<=c;i3++)
                v[i1][i2][i3]=1;
    int times,time;
    int x1,x2,y1,y2,z1,z2;
    scanf("%d",&times);
    for(time=1;time<=times;time++)
    {
        scanf("%d%d%d%d%d%d",&x1,&y1,&z1,&x2,&y2,&z2);
        for(i1=x1;i1<=x2;i1++)
            for(i2=y1;i2<=y2;i2++)
                for(i3=z1;i3<=z2;i3++)
                    v[i1][i2][i3]=0;
    }
    int sum=0;
    for(i1=1;i1<=a;i1++)
        for(i2=1;i2<=b;i2++)
            for(i3=1;i3<=c;i3++)
                sum+=v[i1][i2][i3];
    printf("%d",sum);
}
//有点小抽象，其他都还好