s = input().split() w = int(int(s[0])) x = int(int(s[1])) h = int(int(s[2])) count = 0 lst = [[[0 for k in range(h)] for j in range(x)] for i in range(w)]

for i in range(int(input())): s1 = input().split() x1 = int(int(s1[0])) y1 = int(int(s1[1])) z1 = int(int(s1[2])) x2 = int(int(s1[3])) y2 = int(int(s1[4])) z2 = int(int(s1[5])) for o in range(x1, x2 + 1): for j in range(y1, y2 + 1): for k in range(z1, z2 + 1): lst[o][j][k] = 1

for o in range(w): for j in range(x): for k in range(h): if lst[o][j][k] == 0: count += 1 print(count)