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

#define int long long

int32_t main() {
    int n, k;
    cin >> n >> k;

    vector<pair<int, int>> a(n);
    for (int i = 0; i < n; ++i) {
        int x, y;
        cin >> x >> y;
        a[i] = {y, x};
    }

    sort(a.begin(), a.end());

    int ans = 0;
    vector<pair<int, int>> b(k, {0, 0});
    for (int i = 0; i < n; ++i) {
        int st = a[i].second;
        int ed = a[i].first;

        for (int j = 0; j < k; ++j) {
            if (b[j].second <= st) {
                b[j] = {st, ed};
                ++ans;
                break;
            }
        }
    }

    cout << ans << endl;
}