w,x,h=map(int,input().split())
a=[[[1]*h for i in range(w)]for j in range(x)]
y=int(input())
for i in range(y):
    x1,y1,z1,x2,y2,z2=map(int,input().split())
    for j in range(x1-1,x2):
        for k in range(y1-1,y2):
            for l in range(z1-1,z2):
                a[j][k][l]=0
s=0
for j in range(w):
    for k in range(x):
        for l in range(h):
            s+=a[j][k][l]
print(s)