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() }.sorted()

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

    fun f(ai : Long) : Long {
        val l = a.map { abs(ai - it) }.toMutableList().sorted()
        return -l.sum() + l.take(k).sum() * 2
    }

    var ans = minOf(f(amin), f(amax))
    if (n%2 == 1) ans = minOf(ans, f(a[n/2]))
    else {
        ans = minOf(ans,  f((a[n/2-1] + a[n/2]) / 2 ) )
        ans = minOf(ans,  f(a[n/2-1]))
        ans = minOf(ans,  f((a[n/2-1] + a[n/2]) / 2 +1) )
        ans = minOf(ans,  f(a[n/2]))
    }

    println(ans)
}