local c = tonumber(io.stdin:read("*l")) + tonumber(io.stdin:read("*l"))
local n = tonumber(io.stdin:read("*l"))

local t,r = {},0
for i=1,n do
	local s = io.stdin:read("*l")
	if t[s] == nil then
		t[s] = true
	else
		r = r + c
	end
end

print(r)