#include <iostream>
#include <cstdint>
#include <vector>
#include <algorithm>
#include <queue>
#include <functional>

using namespace std;

template<typename T> constexpr T chmax(T& variable, const T value) noexcept
{
	if (variable < value) return (variable = value);
	else return variable;
}

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

	uint32_t N, H, i;
	cin >> N >> H;
	vector<pair<uint32_t, uint32_t>> stream_time(N);
	for (i = 0; i != N; ++i) cin >> stream_time[i].first >> stream_time[i].second;

	uint32_t ans = 0;
	priority_queue<uint32_t, vector<uint32_t>, greater<uint32_t>> pq;
	pq.push(UINT32_MAX);
	for (i = 0; i != N; ++i)
	{
		while (pq.top() < stream_time[i].first) pq.pop();
		pq.push(stream_time[i].second);
		chmax<uint32_t>(ans, pq.size() - 1);
	}

	cout << ans << '\n';
	return 0;
}