a = list(map(int,input().split()))
b = [[[1 for i in range(a[0])] for j in range(a[1])] for l in range(a[2])]
c = int(input())
n = 0
for i in range(c):
    d = list(map(int,input().split()))
    d1 = d[:3:]
    d2 = d[3:7:]
    for j in range(d1[0],d2[0]+1):
        for p in range(d1[1],d2[1]+1):
            for m in range(d1[2],d2[2]+1):
                b[j][p][m] = 0
for i in range(a[2]):
    for j in range(a[1]):
        n += sum(b[i][j])
print(n)