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*/

#include <bits/stdc++.h>
using namespace std;

using VI = vector<int>;
using VVI = vector<VI>;
using PII = pair<int, int>;
using LL = long long;
using VL = vector<LL>;
using VVL = vector<VL>;
using PLL = pair<LL, LL>;
using VS = vector<string>;

#define ALL(a)  begin((a)),end((a))
#define RALL(a) (a).rbegin(), (a).rend()
#define PB push_back
#define EB emplace_back
#define MP make_pair
#define MT make_tuple
#define SZ(a) int((a).size())
#define SORT(c) sort(ALL((c)))
#define RSORT(c) sort(RALL((c)))
#define UNIQ(c) (c).erase(unique(ALL((c))), end((c)))

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)

#define FF first
#define SS second

template<class S, class T>
istream& operator>>(istream& is, pair<S,T>& p){
  return is >> p.FF >> p.SS;
}
template<class T>
istream& operator>>(istream& is, vector<T>& xs){
  for(auto& x: xs)
	is >> x;
  return is;
}
template<class S, class T>
ostream& operator<<(ostream& os, const pair<S,T>& p){
  return os << p.FF << " " << p.SS;
}
template<class T>
ostream& operator<<(ostream& os, const vector<T>& xs){
  for(unsigned int i=0;i<xs.size();++i)
	os << (i?" ":"") << xs[i];
  return os;
}
template<class T>
void maxi(T& x, T y){
  if(x < y) x = y;
}
template<class T>
void mini(T& x, T y){
  if(x > y) x = y;
}
void debug(istringstream&){}
template <char sep=',', class Head, class... Tail>
void debug(istringstream& iss, Head&& head, Tail&&... tail)
{
  string name;
  getline(iss, name, ',');
  cout << sep << name << "=" << head;
  debug(iss, forward<Tail>(tail)...);
}

#ifdef PYONPOI
#define DEBUG(...) \
  do{ \
    istringstream ss(#__VA_ARGS__); \
    debug<' '>(ss, __VA_ARGS__); \
    cout<<endl; \
  }while(0)
#else
#define DEBUG
#endif


const double EPS = 1e-10;
const double PI  = acos(-1.0);
const LL MOD = 1e9+7;

const int MAX_LOG = 20;
VI mn[MAX_LOG];
VI mx[MAX_LOG];
class SparseTable{
private:
  int n;
  VI logTable;
public:
  SparseTable(int n, const VI& xs): n(n)
  {
    logTable.resize(n+1);
    logTable[0] = logTable[1] = 0;
    for(int i=2;i<=n;++i)
      logTable[i] = logTable[i>>1] + 1;
    
    mn[0] = mx[0] = xs;
    for(int i=1;i<MAX_LOG;++i){
      mn[i].resize(n);
      mx[i].resize(n);
      for(int j=0;j<n;++j){
        mn[i][j] = min(mn[i-1][j], mn[i-1][min(n-1, j + (1<<(i-1)))]);
        mx[i][j] = max(mx[i-1][j], mx[i-1][min(n-1, j + (1<<(i-1)))]);
      }
    }
  }

  // RMQ [l,r)
  int query_min(int l, int r){
    int d = logTable[r - l];
    return min(mn[d][l], mn[d][r - (1<<d)]);
  }
  int query_max(int l, int r){
    int d = logTable[r - l];
    return max(mx[d][l], mx[d][r - (1<<d)]);
  }
};


int main(){
  cin.tie(0);
  ios_base::sync_with_stdio(false);

  int N, K;
  cin >> N >> K;
  VI xs(N);
  cin >> xs;

  REP(i,K+1) xs.PB(N + i);

  VI ord(N);
  ord.back() = 1;
  for(int i=N-2;i>=0;--i){
    ord[i] = 1;
    if(xs[i] < xs[i+1]) ord[i] += ord[i+1];
  }

  SparseTable sp(SZ(xs), xs);

  int ans = 0, nop = 0;
  for(int i=0;i+K<=N;){
    int k = 1;
    for(;k<K;++k){
      if(xs[i+k-1] == sp.query_min(i+k-1, i+k+K-1)
        && sp.query_max(i, i+k+K) == xs[i+k+K-1]){
      }
      else break;
    }
    
    if(ord[i] >= K) ++nop;
    else ++ans;

    i += k;
  }
  mini(nop, 1);
  DEBUG(nop);
  ans += nop;
  cout << ans << endl;

  return 0;
}

Measured memory_bytes: 67796