#include <bits/stdc++.h>
#include <atcoder/all>

using namespace std;

using int64 = long long;
const int mod = 1e9 + 7;
// const int mod = 998244353;

const int64 infll = (1LL << 62) - 1;
const int inf = (1 << 30) - 1;

struct IoSetup {
  IoSetup() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(10);
    cerr << fixed << setprecision(10);
  }
} iosetup;


template< typename T1, typename T2 >
ostream &operator<<(ostream &os, const pair< T1, T2 > &p) {
  os << p.first << " " << p.second;
  return os;
}

template< typename T1, typename T2 >
istream &operator>>(istream &is, pair< T1, T2 > &p) {
  is >> p.first >> p.second;
  return is;
}

template< typename T >
ostream &operator<<(ostream &os, const vector< T > &v) {
  for(int i = 0; i < (int) v.size(); i++) {
    os << v[i] << (i + 1 != v.size() ? " " : "");
  }
  return os;
}

template< typename T >
istream &operator>>(istream &is, vector< T > &v) {
  for(T &in: v) is >> in;
  return is;
}

template< typename T1, typename T2 >
inline bool chmax(T1 &a, T2 b) { return a < b && (a = b, true); }

template< typename T1, typename T2 >
inline bool chmin(T1 &a, T2 b) { return a > b && (a = b, true); }

template< typename T = int64 >
vector< T > make_v(size_t a) {
  return vector< T >(a);
}

template< typename T, typename... Ts >
auto make_v(size_t a, Ts... ts) {
  return vector< decltype(make_v< T >(ts...)) >(a, make_v< T >(ts...));
}

template< typename T, typename V >
typename enable_if< is_class< T >::value == 0 >::type fill_v(T &t, const V &v) {
  t = v;
}

template< typename T, typename V >
typename enable_if< is_class< T >::value != 0 >::type fill_v(T &t, const V &v) {
  for(auto &e: t) fill_v(e, v);
}

template< typename F >
struct FixPoint : F {
  FixPoint(F &&f) : F(forward< F >(f)) {}

  template< typename... Args >
  decltype(auto) operator()(Args &&... args) const {
    return F::operator()(*this, forward< Args >(args)...);
  }
};

template< typename F >
inline decltype(auto) MFP(F &&f) {
  return FixPoint< F >{forward< F >(f)};
}

/**
 * @brief Binary-Indexed-Tree(BIT)
 * @docs docs/binary-indexed-tree.md
 */
template< typename T >
struct BinaryIndexedTree {
private:
  int n;
  vector< T > data;

public:
  BinaryIndexedTree() = default;

  explicit BinaryIndexedTree(int n) : n(n) {
    data.assign(n + 1, 0);
  }

  explicit BinaryIndexedTree(const vector< T > &v) :
      BinaryIndexedTree((int) v.size()) {
    build(v);
  }

  void build(const vector< T > &v) {
    assert(n == (int) v.size());
    for(int i = 1; i <= n; i++) data[i] = v[i - 1];
    for(int i = 1; i <= n; i++) {
      int j = i + (i & -i);
      if(j <= n) data[j] += data[i];
    }
  }

  void apply(int k, const T &x) {
    for(++k; k <= n; k += k & -k) data[k] += x;
  }

  T prod(int r) const {
    T ret = T();
    for(; r > 0; r -= r & -r) ret += data[r];
    return ret;
  }

  T prod(int l, int r) const {
    return prod(r) - prod(l);
  }

  int lower_bound(T x) const {
    int i = 0;
    for(int k = 1 << (__lg(n) + 1); k > 0; k >>= 1) {
      if(i + k <= n && data[i + k] < x) {
        x -= data[i + k];
        i += k;
      }
    }
    return i;
  }

  int upper_bound(T x) const {
    int i = 0;
    for(int k = 1 << (__lg(n) + 1); k > 0; k >>= 1) {
      if(i + k <= n && data[i + k] <= x) {
        x -= data[i + k];
        i += k;
      }
    }
    return i;
  }
};


int M, K;

/**
 * @brief Abstract 2D Binary Indexed Tree Compressed(抽象化2次元座圧BIT)
 */
template< typename T >
struct Abstract2DBinaryIndexedTreeCompressed {
private:
  int n;
  vector< BinaryIndexedTree< T > > data;
  vector< vector< int > > beet;
public:
  Abstract2DBinaryIndexedTreeCompressed(const vector< int > &hs) :
      n((int) hs.size() / 2) {
    vector< int > ord(2 * n);
    iota(begin(ord), end(ord), 0);
    sort(begin(ord), end(ord), [&](int a, int b) {
      return hs[a] < hs[b];
    });
    beet.resize(n + 1);
    for(auto &&i: ord) {
      int d = hs[i];
      i /= 2;
      for(int k = i + 1; k <= n; k += k & -k) {
        beet[k].emplace_back(d);
      }
    }
    data.reserve(n + 1);
    for(int k = 0; k <= n; k++) {
      //beet[k].erase(unique(begin(beet[k]), end(beet[k])), end(beet[k]));
      vector< int > luz(beet[k].size());
      for(int i = 0; i < beet[k].size(); i++) {
        luz[i] = (beet[k][i] % (2 * M) < M);
      };
      data.emplace_back(luz);
    }
  }

  void apply(int k1, int k2) {
    for(++k1; k1 <= n; k1 += k1 & -k1) {
      int p = lower_bound(begin(beet[k1]), end(beet[k1]), k2) - begin(beet[k1]);
      data[k1].apply(p, -1);
      int q = lower_bound(begin(beet[k1]) + p, end(beet[k1]), k2 + M) - begin(beet[k1]);
      data[k1].apply(q, 1);
    }
  }

  T prod(int r1, int r2) const {
    T ret{0};
    for(; r1 > 0; r1 -= r1 & -r1) {
      int p = lower_bound(begin(beet[r1]), end(beet[r1]), r2) - begin(beet[r1]);
      ret += data[r1].prod(p);
    }
    return ret;
  }
};

int main() {
  cin >> M >> K;
  vector< int > A(M * K);
  for(auto &a: A) cin >> a;

  vector D(M, vector< int >());
  {
    for(int i = 0; i < M * K; i++) {
      D[A[i]].emplace_back(i);
      A[i] += 2 * (D[A[i]].size() - 1) * M;
    }
  }
  vector< int > vs(2 * M * K);
  BinaryIndexedTree< int > bit(M * K * 2);
  int64_t now = 0;
  for(int i = M * K - 1; i >= 0; i--) {
    now += bit.prod(A[i]);
    bit.apply(A[i], 1);
    vs[2 * i + 0] = A[i];
    vs[2 * i + 1] = A[i] + M;
  }
  Abstract2DBinaryIndexedTreeCompressed< int > mat(vs);
  int64_t ret = now;
  for(int $ = 0; $ < M; $++) {
    for(auto &i: D[$]) {
      int x;
      now -= i - (x = mat.prod(i, A[i]));
      now -= bit.prod(A[i]) - x;
      mat.apply(i, A[i]);
      bit.apply(A[i], -1);
      A[i] += M;
      bit.apply(A[i], 1);
      now += i - (x = mat.prod(i, A[i]));
      now += bit.prod(A[i]) - x;
    }
    ret = min(ret, now);
  }
  cout << ret << "\n";
}