package yukicoder

fun main() {
    val (n, m) = readLine()!!.split(" ").map(String::toInt)
    val scores = mutableSetOf<Triple<Int, Int, Int>>()
    (0 until m).forEach {
        val (item1, item2, score) = readLine()!!.split(" ").map(String::toInt)
        scores.add(Triple(item1, item2, score))
    }

    fun getScore(items: IntArray): Int =
        scores.filter { items.indexOf(it.first) < items.indexOf(it.second) }.sumBy { it.third }

    fun getMaxScore(vararg items: Int): Int {
        return when (items.size >= n) {
            true -> getScore(items)
            false -> (0..n).filter { !items.contains(it) }.map { getMaxScore(*items, it) }.max()!!
        }
    }
    println(getMaxScore())
}