fun main(args: Array<String>) {
	val N = readLine()!!.toInt()
	val K = readLine()!!.toInt()

	val a = mutableListOf<Int>()

	for (i in 0 until N) {
		val n = readLine()!!.toInt()
		a.add(n)
	}
	println(a.max()!! - a.min()!!)
}