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M = int(input())
N = int(input())
K = int(input())

commands = set()

rows = 0
cols = 0

for i in range(K):
    a, b = input().split()
    c = (a, int(b))
    if c in commands:
        commands.remove(c)
        if a == "R":
            rows -= 1
        elif a == "C":
            cols -= 1
    else:
        commands.add(c)
        if a == "R":
            rows += 1
        elif a == "C":
            cols += 1

print(rows * N + (M - rows) * cols - rows * cols)