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)