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

#define REP(i, m, n) for (int i = (m); i < (int)(n); i++)
#define REPS(i, m, n) for (int i = (m); i <= (int)(n); i++)
#define rep(i, n) REP(i, 0, n)
#define reps(i, n) for (int i = 0; i <= (int)(n); i++)
#define rrep(i, x) for (int i = ((int)(x)-1); i >= 0; i--)
#define rreps(i, x) for (int i = (int)(x); i >= 0; i--)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define pb push_back
typedef long long ll;
typedef pair<int, int> P;
const int inf = INT_MAX;
const ll INF = 1LL << 60;
const ll mod = 1e9 + 7;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
template<typename A, size_t N, typename T> void Fill(A (&array)[N], const T &val) { fill( (T*)array, (T*)(array+N), val ); }

class UnionFind {
public:
    vector<ll> par;
    vector<ll> siz;

    UnionFind(ll sz_) : par(sz_), siz(sz_, 1LL) {
        for (ll i = 0; i < sz_; ++i)
            par[i] = i;
    }
    void init(ll sz_) {
        par.resize(sz_);
        siz.assign(sz_, 1LL);
        for (ll i = 0; i < sz_; ++i)
            par[i] = i;
    }

    ll root(ll x) {
        while (par[x] != x) {
            x = par[x] = par[par[x]];
        }
        return x;
    }

    bool unite(ll x, ll y) {
        x = root(x);
        y = root(y);
        if (x == y)
            return false;
        if (siz[x] < siz[y])
            swap(x, y);
        siz[x] += siz[y];
        par[y] = x;
        return true;
    }

    bool issame(ll x, ll y) {
        return root(x) == root(y);
    }

    ll size(ll x) {
        return siz[root(x)];
    }
};

struct SegmentTree {
private:
    int n;
    vector<int> node;
public:
    SegmentTree(vector<int> v) {
        int sz = v.size();
        n = 1;
        // 2の累乗の大きさにする
        while (n < sz) n *= 2;
        // 余りをinfで埋める
        node.resize(2*n-1, inf);
        // 葉を構築
        for (int i = 0; i < sz; i++) {
            node[i+n-1] = v[i];
        }
        // 親を構築
        for (int i = n - 2; i >= 0; i--) {
            node[i] = min(node[2*i+1], node[2*i+2]);
        }
    }

    void update(int x, int val) {
        x += (n - 1);
        node[x] = val;
        while (x > 0) {
            x = (x - 1) / 2;
            node[x] = min(node[2*x+1], node[2*x+2]);
        }
    }

    int getmin(int a, int b, int k = 0, int l = 0, int r = -1) {
        if (r < 0) r = n;
        if (r <= a || b <= l) return inf;
        if (a <= l && r <= b) return node[k];
        int vl = getmin(a, b, 2*k+1, l, (l+r) / 2);
        int vr = getmin(a, b, 2*k+2, (l+r) / 2, r);
        return min(vl, vr);
    }
};

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

    int n, k; cin >> n >> k;
    SegmentTree sg1(vector<int>(n+1, inf)), sg2(vector<int>(n+1, inf));
    vector<int> a(n);
    rep(i, n) {
        cin >> a[i];
        sg1.update(i, a[i]);
        sg2.update(i, -a[i]);
    }
    UnionFind uf(n+1);
    REP(i, 1, n-k+1) {
        if (sg1.getmin(i-1, i+k-1) == a[i-1] && sg2.getmin(i, i+k) == -a[k+i-1]) {
            uf.unite(i-1, i);
        }
    }
    vector<int> sum(n);
    rep(i, n-1) {
        sum[i+1] = (a[i] > a[i+1]);
    }
    rep(i, n-1) sum[i+1] += sum[i];
    rep(i, n-k+1) {
        if (sum[i] == sum[i+k-1]) {
            uf.unite(i, n);
        }
    }
    int ans = 0;
    rep(i, n-k+1) {
        if (uf.root(i) == i) ans++;
    }
    cout << ans << endl;
    return 0;
}


Measured memory_bytes: 9072