i,ip=int,input
son, n, w = i(ip())+i(ip()), i(ip()), 0
book = sorted([ip() for _ in range(n)])
for i in book:
    a = book.count(i)
    if a != 1:
        w += a - 1
        for _ in range(a-1):book.remove(i)
print(w*son)