import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

from collections import Counter

p1,p2,n,*R = map(int,read().split())

p = p1 + p2

counter = Counter(R)

x = sum(x - 1 if x > 1 else 0 for x in counter.values())
answer = p * x
print(answer)