# coding: utf-8
# Your code here!
hotel = {}
h1 = int(input())
h2 = int(input())
n = int(input())
for i in range(n):
    r = input()
    if r not in hotel:
        hotel[r] = 1
    else:
        hotel[r] += 1
loss = 0
for key, value in hotel.items():
    if value >= 2:
        loss += value - 1
print((h1 + h2) * loss)