#include <bits/stdc++.h>
using namespace std;
const int maxx = 2e5 + 100;
int a[maxx], num[maxx], cnt[maxx];
long long pre[maxx], suf[maxx], pcnt[maxx], scnt[maxx];
int n, k;
int main() {
  scanf("%d%d", &n, &k);
  for (int i = 1; i <= n; i++) scanf("%d", &a[i]);
  sort(a + 1, a + 1 + n);
  int S = 0, m = 1;
  for (int i = 1; i <= n; i++) {
    S++;
    if (a[i] != a[i + 1]) {
      m++;
      num[m] = a[i], cnt[m] = S;
      S = 0;
    }
  }
  for (int i = 2; i <= m; i++) {
    pre[i] = pre[i - 1] + pcnt[i - 1] * (num[i] - num[i - 1]) +
             cnt[i - 1] * (num[i] - num[i - 1] - 1);
    pcnt[i] = pcnt[i - 1] + cnt[i - 1];
  }
  for (int i = m - 1; i >= 1; i--) {
    suf[i] = suf[i + 1] + scnt[i + 1] * (num[i + 1] - num[i]) +
             cnt[i + 1] * (num[i + 1] - num[i] - 1);
    scnt[i] = scnt[i + 1] + cnt[i + 1];
  }
  long long ans = 1e18;
  for (int i = 1; i <= m; i++) {
    int res = k - cnt[i];
    if (res <= 0) {
      puts("0");
      return 0;
    }
    if (i > 1 && i < m) ans = min(ans, pre[i] + suf[i] + res);
    if (i > 1 && pcnt[i] >= res) ans = min(ans, pre[i] + res);
    if (i < m && scnt[i] >= res) ans = min(ans, suf[i] + res);
  }
  printf("%lld\n", ans);
  return 0;
}
