import kotlin.collections.*
import kotlin.math.*

@kotlin.ExperimentalStdlibApi
fun main() {
    val (n, k) = readLine()!!.split(" ").map { it.toInt() }
    val a = readLine()!!.split(" ").map { it.toLong() }.toTypedArray().sorted()

    val amin = a.min()!!
    val amax = a.max()!!

    fun f(ai : Long) : Long {
        val l = a.map { abs(ai - it) }.sorted()
        return l.take(k).sum() - l.takeLast(n-k).sum()
    }

    var l = 0; var r = n - 1
    while(l + 10 < r) {
        val ll = (l+l+r) / 3
        val rr = (l+r+r) / 3

        if (f(a[ll]) < f(a[rr])) r = rr
        else l = ll
    }

    var ans = minOf(f(a.first()), f(a.last()))
    for (i in l .. r) {
        ans = minOf(ans, f(a[i]))
    }
    println(ans)
}