#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)
#define fore(i,a) for(auto &i:a)
#define all(x) (x).begin(),(x).end()
#pragma GCC optimize ("-O3")
using namespace std; void _main(); int main() { cin.tie(0); ios::sync_with_stdio(false); _main(); }
typedef long long ll; const int inf = INT_MAX / 2; const ll infl = 1LL << 60;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a = b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a = b; return 1; } return 0; }
//---------------------------------------------------------------------------------------------------
template<class V> struct BIT {
    BIT() {}  // [L, R)
    int NV; vector<V> bit;
    BIT(int n) { init(n); }
    void init(int n) { NV = 1; while (NV<n)NV *= 2; bit.resize(NV); }
    V operator[](int e) { V s = 0; e++; while (e) s += bit[e - 1], e -= e & -e; return s; }
    void add(int e, V v) { e++; while (e <= NV) bit[e - 1] += v, e += e & -e; }
    int lower_bound(V val) {
        V tv = 0; int i, ent = 0; for (i = NV - 1; i >= 0; i--)
            if (tv + bit[ent + (1 << i) - 1] <= val)tv += bit[ent + (1 << i) - 1], ent += (1 << i); return ent;
    }
    V get(int L, int R) {
        assert(0 <= L); assert(R <= NV); assert(L <= R);
        V res = 0; if (R) res += operator[](R - 1); if (L) res -= operator[](L - 1); return res;
    }
    void clear() { bit.clear(); }
};

// StaticHealthy2DSegtree
#define def 0
using V = ll;
V comp(V& l, V& r) { return l + r; };
struct SegTree { //[l,r)
    int NV;
    vector<V> val;
    void init(int n) {
        NV = 1;
        while (NV < n) NV *= 2;
        val = vector<V>(NV * 2, def);
    }
    V get(int x, int y, int l, int r, int k) {
        if (r <= x || y <= l) return def; if (x <= l && r <= y)return val[k];
        auto a = get(x, y, l, (l + r) / 2, k * 2); auto b = get(x, y, (l + r) / 2, r, k * 2 + 1); return comp(a, b);
    }
    V get(int x, int y) { return get(x, y, 0, NV, 1); }
    void update(int i, V v) { i += NV; val[i] = v; while (i>1)i >>= 1, val[i] = comp(val[i * 2], val[i * 2 + 1]); }
    void compupdate(int i, V v) { update(i, comp(v, val[i + NV])); }
    void add(int i, V v) { update(i, val[i + NV] + v); }
    V operator[](int x) { return get(x, x + 1); }
};

struct StaticHealthy2DSegTree {
    int NV;
    vector<SegTree> st;
    vector<vector<int>> index;

    void init(vector<vector<pair<int, V>>> &v) {
        int n = v.size();
        NV = 1; while (NV < n) NV *= 2;
        index.resize(2 * NV);
        rep(i, 0, n) fore(p, v[i]) index[i + NV].push_back(p.first);
        rrep(i, NV * 2 - 1, 1) {
            sort(index[i].begin(), index[i].end());
            index[i].erase(unique(index[i].begin(), index[i].end()), index[i].end());
            fore(j, index[i]) index[i / 2].push_back(j);
        }
        st.resize(2 * NV);
        rep(i, 1, NV * 2) st[i].init(index[i].size());

        rep(i, 0, n) fore(p, v[i]) {
            int j = lower_bound(index[i + NV].begin(), index[i + NV].end(), p.first) - index[i + NV].begin();
            st[i + NV].update(j, p.second);
        }

        rrep(i, NV * 2 - 1, 2) {
            rep(j, 0, index[i].size()) {
                V v = st[i][j];

                int k = lower_bound(index[i / 2].begin(), index[i / 2].end(), index[i][j]) - index[i / 2].begin();
                st[i / 2].compupdate(k, v);
            }
        }
    }
    V get(int sx, int tx, int sy, int ty, int k, int l, int r) {
        assert(k < NV * 2);
        assert(l < r);
        if (r <= sx or tx <= l) return def;
        if (sx <= l and r <= tx) {
            int syy = lower_bound(index[k].begin(), index[k].end(), sy) - index[k].begin();
            int tyy = lower_bound(index[k].begin(), index[k].end(), ty) - index[k].begin();
            return st[k].get(syy, tyy);
        }
        int md = (l + r) / 2;
        V le = get(sx, tx, sy, ty, k * 2, l, md);
        V ri = get(sx, tx, sy, ty, k * 2 + 1, md, r);
        return comp(le, ri);
    }
    V get(int sx, int tx, int sy, int ty) {
        return get(sx, tx, sy, ty, 1, 0, NV);
    }
};
/*---------------------------------------------------------------------------------------------------
　　　　　　　　　　　 ∧＿∧  
　　　　　 ∧＿∧ 　（´<_｀ ）　 Welcome to My Coding Space!
　　　　 （ ´_ゝ`）　/　 ⌒i     
　　　　／　　　＼　 　 |　|     
　　　 /　　 /￣￣￣￣/　　|  
　 ＿_(__ﾆつ/　    ＿/ .| .|＿＿＿＿  
　 　　　＼/＿＿＿＿/　（u　⊃  
---------------------------------------------------------------------------------------------------*/





int N, K, A[101010], M;
BIT<int> bit(101010);
StaticHealthy2DSegTree st;
//---------------------------------------------------------------------------------------------------
void _main() {
    cin >> N >> K;
    rep(i, 0, N) cin >> A[i];

    vector<int> dic;
    rep(i, 0, N) dic.push_back(A[i]);
    sort(all(dic));
    dic.erase(unique(all(dic)), dic.end());
    M = dic.size();

    vector<vector<pair<int, ll>>> v(N);
    rep(i, 0, N) {
        int y = lower_bound(all(dic), A[i]) - dic.begin();
        v[i].push_back({y, A[i]});
        A[i] = y;
    }
    st.init(v);

    ll ans = infl;
    rep(i, 0, K - 1) bit.add(A[i], 1);
    rep(L, 0, N - K + 1) {
        int R = L + K;
        bit.add(A[R - 1], 1);

        int ng = 0, ok = M;
        while (ng + 1 != ok) {
            int md = (ng + ok) / 2;
            if (K / 2 < bit.get(0, md)) ok = md;
            else ng = md;
        }
        ok--;

        rep(d, -1, 1) {
            int ok2 = ok + d;
            if (ok2 < 0) continue;

            ll cent = dic[ok2];
            ll low = st.get(L, R, 0, ok2);
            ll high = st.get(L, R, ok2 + 1, inf);
            ll cst = bit.get(0, ok2) * cent - low + high - bit.get(ok2 + 1, M) * cent;
            chmin(ans, cst);
        }

        bit.add(A[L], -1);
    }

    cout << ans << endl;
}