fun main(args: Array<String>){
    val symbolCount = readLine()!!.toLong()
    val numberCount = readLine()!!.toLong()
    val cardCount = readLine()!!.toInt()
    val symbolList = mutableMapOf<Long, Boolean>()
    val numberList = mutableMapOf<Long, Boolean>()
    for(i in 1..cardCount) {
        val (s,k) = readLine()!!.trim().split(" ").map { it.toLong() }
        symbolList[s] = true
        numberList[k] = true
    }
    val ans = symbolList.size * numberCount + symbolCount * numberList.size - symbolList.size * numberList.size - cardCount
    println(ans)
}