fun main(args: Array<String>) {
    val inputCount = readLine()!!.toInt()
    val groupCount = readLine()!!.toInt()
    val items = mutableListOf<Int>()

    (1..inputCount).forEach {
        items.add(readLine()!!.toInt())
    }

    val ans = items.max()!! - items.min()!!
    println(ans)
}