There is a rectangle in the xy-plane, with its lower left corner at (0, 0) and its upper right corner at (W, H). Each of its sides is parallel to the x-axis or y-axis. Initially, the whole region within the rectangle is painted white.  Snuke plotted N points into the rectangle. The coordinate of the i-th (1 ≦ i ≦ N) point was (x_i, y_i).  Then, he created an integer sequence a of length N, and for each 1 ≦ i ≦ N, he painted some region within the rectangle black, as follows:    * If a_i = 1, he painted the region satisfying x < x_i within the rectangle.   * If a_i = 2, he painted the region satisfying x > x_i within the rectangle.   * If a_i = 3, he painted the region satisfying y < y_i within the rectangle.   * If a_i = 4, he painted the region satisfying y > y_i within the rectangle.  Find the area of the white region within the rectangle after he finished painting.
W,H,N = map(int,input().split())
lst = [list(map(int,input().split())) for i in range(N)]

#print(W,H,N)
#print(lst)

#print(lst)
Wst = [1]*W
Hst = [1]*H
for i in range(N):
    if lst[i][2] == 1:
        for j in range(lst[i][0]):
            Wst[j] = 0
    if lst[i][2] == 2:
        print(lst[i][0],W)
        for j in range(lst[i][0],W):
            Wst[j] = 0
    if lst[i][2] == 3:
        for j in range(lst[i][1]):
            Hst[j] = 0
    if lst[i][2] == 4:
        print(lst[i][0],W)
        for j in range(lst[i][1],H):
            Hst[j] = 0
    

print(sum(Wst)*sum(Hst))
W,H,N = map(int,input().split())
lst = [list(map(int,input().split())) for i in range(N)]

#print(W,H,N)
#print(lst)

#print(lst)
Wst = [1]*W
Hst = [1]*H
for i in range(N):
    if lst[i][2] == 1:
        for j in range(lst[i][0]):
            Wst[j] = 0
    if lst[i][2] == 2:
        #print(lst[i][0],W)
        for j in range(lst[i][0],W):
            Wst[j] = 0
    if lst[i][2] == 3:
        for j in range(lst[i][1]):
            Hst[j] = 0
    if lst[i][2] == 4:
        #print(lst[i][0],W)
        for j in range(lst[i][1],H):
            Hst[j] = 0
    

print(sum(Wst)*sum(Hst))