// need
#include <iostream>
#include <algorithm>
// data structure
#include <bitset>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <utility>
#include <vector>
#include <complex>
//#include <deque>
#include <valarray>
#include <unordered_map>
#include <unordered_set>
#include <array>
// etc
#include <cassert>
#include <cmath>
#include <functional>
#include <iomanip>
#include <chrono>
#include <random>
#include <numeric>

// input
#define INIT std::ios::sync_with_stdio(false);std::cin.tie(0);
#define VAR(type, ...)type __VA_ARGS__;MACRO_VAR_Scan(__VA_ARGS__);
template<typename T> void MACRO_VAR_Scan(T& t) { std::cin >> t; }
template<typename First, typename...Rest>void MACRO_VAR_Scan(First& first, Rest& ...rest) { std::cin >> first; MACRO_VAR_Scan(rest...); }
#define VEC_ROW(type, n, ...)std::vector<type> __VA_ARGS__;MACRO_VEC_ROW_Init(n, __VA_ARGS__); for(int w_=0; w_<n; ++w_){MACRO_VEC_ROW_Scan(w_, __VA_ARGS__);}
template<typename T> void MACRO_VEC_ROW_Init(int n, T& t) { t.resize(n); }
template<typename First, typename...Rest>void MACRO_VEC_ROW_Init(int n, First& first, Rest& ...rest) { first.resize(n); MACRO_VEC_ROW_Init(n, rest...); }
template<typename T> void MACRO_VEC_ROW_Scan(int p, T& t) { std::cin >> t[p]; }
template<typename First, typename...Rest>void MACRO_VEC_ROW_Scan(int p, First& first, Rest& ...rest) { std::cin >> first[p]; MACRO_VEC_ROW_Scan(p, rest...); }
#define VEC(type, c, n) std::vector<type> c(n);for(auto& i:c)std::cin>>i;
#define MAT(type, c, m, n) std::vector<std::vector<type>> c(m, std::vector<type>(n));for(auto& R:c)for(auto& w:R)std::cin>>w;
// output
template<typename T>void MACRO_OUT(const T t) { std::cout << t; }
template<typename First, typename...Rest>void MACRO_OUT(const First first, const Rest...rest) { std::cout << first << " "; MACRO_OUT(rest...); }
#define OUT(...) MACRO_OUT(__VA_ARGS__);
#define FOUT(n, dist) std::cout<<std::fixed<<std::setprecision(n)<<(dist);
#define SOUT(n, c, dist) std::cout<<std::setw(n)<<std::setfill(c)<<(dist);
#define SP std::cout<<" ";
#define TAB std::cout<<"\t";
#define BR std::cout<<"\n";
#define SPBR(w, n) std::cout<<(w + 1 == n ? '\n' : ' ');
#define ENDL std::cout<<std::endl;
#define FLUSH std::cout<<std::flush;
#define SHOW(dist) {std::cerr << #dist << "\t:" << (dist) << "\n";}
#define SHOWVECTOR(v) {std::cerr << #v << "\t:";for(const auto& xxx : v){std::cerr << xxx << " ";}std::cerr << "\n";}
#define SHOWVECTOR2(v) {std::cerr << #v << "\t:\n";for(const auto& xxx : v){for(const auto& yyy : xxx){std::cerr << yyy << " ";}std::cerr << "\n";}}
#define SHOWQUEUE(a) {auto tmp(a);std::cerr << #a << "\t:";while(!tmp.empty()){std::cerr << tmp.front() << " ";tmp.pop();}std::cerr << "\n";}
#define SHOWSTACK(a) {auto tmp(a);std::cerr << #a << "\t:";while(!tmp.empty()){std::cerr << tmp.top() << " ";tmp.pop();}std::cerr << "\n";}
// utility
#define ALL(a) (a).begin(),(a).end()
#define FOR(w, a, n) for(int w=(a);w<(n);++w)
#define RFOR(w, a, n) for(int w=(n)-1;w>=(a);--w)
#define REP(w, n) for(int w=0;w<int(n);++w)
#define RREP(w, n) for(int w=int(n)-1;w>=0;--w)
#define IN(a, x, b) (a<=x && x<b)
template<class T> inline T CHMAX(T & a, const T b) { return a = (a < b) ? b : a; }
template<class T> inline T CHMIN(T& a, const T b) { return a = (a > b) ? b : a; }
// test
template<class T> using V = std::vector<T>;
template<class T> using VV = V<V<T>>;

template<typename S, typename T>
std::ostream& operator<<(std::ostream& os, std::pair<S, T> p) {
	os << "(" << p.first << ", " << p.second << ")"; return os;
}

// type/const
#define int ll
using ll = long long;
using ull = unsigned long long;
using ld = long double;
using PAIR = std::pair<int, int>;
using PAIRLL = std::pair<ll, ll>;
constexpr int INFINT = (1 << 30) - 1;                    // 1.07x10^ 9
constexpr int INFINT_LIM = (1LL << 31) - 1;              // 2.15x10^ 9
constexpr ll INFLL = 1LL << 60;                          // 1.15x10^18
constexpr ll INFLL_LIM = (1LL << 62) - 1 + (1LL << 62);  // 9.22x10^18
constexpr double EPS = 1e-10;
constexpr int MOD = 998244353;
constexpr double PI = 3.141592653589793238462643383279;
template<class T, size_t N> void FILL(T(&a)[N], const T & val) { for (auto& x : a) x = val; }
template<class ARY, size_t N, size_t M, class T> void FILL(ARY(&a)[N][M], const T & val) { for (auto& b : a) FILL(b, val); }
template<class T> void FILL(std::vector<T> & a, const T & val) { for (auto& x : a) x = val; }
template<class ARY, class T> void FILL(std::vector<std::vector<ARY>> & a, const T & val) { for (auto& b : a) FILL(b, val); }
// ------------>8------------------------------------->8------------

// ------------>8---------- LazySegmentTree ---------->8------------
namespace MonoidOfValue {
	template <class T> class sum {
	public:
		using value_type = T;
		inline static T op(const T& a, const T& b) { return a + b; }
		inline static value_type id() { return T(0); }
	};
	template <class T> class max {
	public:
		using value_type = T;
		inline static T op(const T& a, const T& b) { return (a < b) ? b : a; }
		inline static T id() { return std::numeric_limits<T>::lowest() + 1; }
	};
	template <class T> class min {
	public:
		using value_type = T;
		inline static T op(const T& a, const T& b) { return (a < b) ? a : b; }
		inline static T id() { return std::numeric_limits<T>::max(); }
	};

	class MONOID {
	public:
		struct S { int x; };
		using T = S;
		using value_type = T;
		inline static T op(const T& l, const T& r) { return S{ 0 }; }
		inline static T id() { return S{ 0 }; }
	};
}
namespace MonoidOfOperator {
	template <class T> class add {
	public:
		using value_type = T;
		inline static T op(const T& a, const T& b) { return a + b; }
		inline static T id() { return T(0); }
	};
	template <class T> class upd {
	public:
		using value_type = T;
		inline static T op(const T& a, const T& b) { return b; }
		inline static T id() { return T(0); }
	};
}
namespace ApplyOperator {
	template <class T1, class T2> class RSQRAQ {
	public:
		inline static T1 op(const T1& a, const T2& b, int w) { return a + b * w; }
	};
	template <class T1, class T2> class RSQRUQ {
	public:
		inline static T1 op(const T1& a, const T2& b, int w) { return b * w; }
	};
	template <class T1, class T2> class RMQRAQ {
	public:
		inline static T1 op(const T1& a, const T2& b, int w) { return a + b; }
	};
	template <class T1, class T2> class RMQRUQ {
	public:
		inline static T1 op(const T1& a, const T2& b, int w) { return b; }
	};
}
template<class MonoidOfValue, class MonoidOfOperator, template<class, class> class ApplyOperator>
class LazySegmentTree {
private:
	using ValueType = typename MonoidOfValue::value_type;
	using OperatorType = typename MonoidOfOperator::value_type;
	using Applier = ApplyOperator<ValueType, OperatorType>;
	std::vector<ValueType> seg;
	std::vector<OperatorType> laz;
	std::vector<bool> isUpdated;
	int HEIGHT;
	int ARY_SIZE;

	void push(int k, int w) {
		if (!isUpdated[k]) {
			seg[k] = Applier::op(seg[k], laz[k], w);
			if (w > 1) {
				laz[(k << 1) + 0] = MonoidOfOperator::op(laz[(k << 1) + 0], laz[k]);
				laz[(k << 1) + 1] = MonoidOfOperator::op(laz[(k << 1) + 1], laz[k]);
				isUpdated[(k << 1) + 0] = false;
				isUpdated[(k << 1) + 1] = false;
			}
			isUpdated[k] = true;
			laz[k] = MonoidOfOperator::id();
		}
	}
	void update(int k, int w) {
		push(k, w);
		if (k < ARY_SIZE) {
			push((k << 1) + 0, w >> 1);
			push((k << 1) + 1, w >> 1);
			seg[k] = MonoidOfValue::op(seg[(k << 1) + 0], seg[(k << 1) + 1]);
		}
	}
public:
	LazySegmentTree(int n) {
		init(n);
	}
	LazySegmentTree(const std::vector<ValueType> & a) {
		init(a.size());
		std::copy(std::begin(a), std::end(a), std::begin(seg) + ARY_SIZE);
		for (int k = ARY_SIZE - 1; k > 0; --k) seg[k] = MonoidOfValue::op(seg[(k << 1) + 0], seg[(k << 1) + 1]);
	}
	void init(int n) {
		HEIGHT = 0;
		while ((1 << HEIGHT) < n) ++HEIGHT;
		ARY_SIZE = 1 << HEIGHT;
		seg.resize(ARY_SIZE << 1, MonoidOfValue::id());
		laz.resize(ARY_SIZE << 1, MonoidOfOperator::id());
		isUpdated.resize(ARY_SIZE << 1, true);
	}
	// ## update [l, r) with v
	void update(int l, int r, OperatorType v) {
		l += ARY_SIZE; r += ARY_SIZE;
		int L = l, R = r - 1;
		for (int i = HEIGHT; i >= 0; --i) push(L >> i, 1 << i), push(R >> i, 1 << i);
		while (l < r) {
			if (l & 1) laz[l] = MonoidOfOperator::op(laz[l], v), isUpdated[l] = false, ++l;
			if (r & 1) --r, laz[r] = MonoidOfOperator::op(laz[r], v), isUpdated[r] = false;
			l >>= 1; r >>= 1;
		}
		for (int i = 1; i <= HEIGHT; ++i) {
			push(L >> i, 1 << i), push(R >> i, 1 << i);
			update(L >> i, 1 << i), update(R >> i, 1 << i);
		}
	}
	// ## return SUM/MAX/MIN in [l, r)
	ValueType query(int l, int r) {
		l += ARY_SIZE; r += ARY_SIZE - 1;
		for (int i = HEIGHT; i >= 0; --i) push(l >> i, 1 << i), push(r >> i, 1 << i);
		++r;
		ValueType vl = MonoidOfValue::id(), vr = MonoidOfValue::id();
		int w = 1;
		while (l < r) {
			if (l & 1) update(l, w), vl = MonoidOfValue::op(vl, seg[l]), ++l;
			if (r & 1) --r, update(r, w), vr = MonoidOfValue::op(seg[r], vr);
			l >>= 1; r >>= 1; w <<= 1;
		}
		return MonoidOfValue::op(vl, vr);
	}
};
// ------------>8---------- LazySegmentTree ---------->8------------

int mycalc(int n, int m, V<int> l, V<int> r) {
	VV<int> L(m + 2);
	REP(i, n) L[r[i]].emplace_back(l[i]);

	int ans = 0;
	LazySegmentTree<MonoidOfValue::max<int>, MonoidOfOperator::add<int>, ApplyOperator::RMQRAQ> st(m + 2);
	st.update(0, m + 2, -st.query(0, 1));
	REP(i, m + 2) st.update(i, i + 1, -i);

	RREP(i, m + 2) {
		std::sort(ALL(L[i]));
		for (int l : L[i]) {
			st.update(l, m + 2, 1);
			CHMAX(ans, st.query(0, m + 2));
		}
		st.update(0, m + 2, -1);
	}
	return ans;
}

// Dinic法
class Dinic {
private:
	struct Edge {
		int to, cap, rev;
		Edge(int t, int c, int r) :to(t), cap(c), rev(r) {}
	};
	int V;
	std::vector<std::vector<Edge>> graph;
	std::vector<int> level, iter;

public:
	Dinic(int v) : V(v) {
		graph.resize(v);
		level.resize(v, -1);
		iter.resize(v, 0);
	}
	// fromからtoへ向かう容量capの辺をグラフに追加する
	void addEdge(int from, int to, int cap) {
		graph[from].emplace_back(to, cap, graph[to].size());
		graph[to].emplace_back(from, 0, graph[from].size() - 1);
	}

	// sからの最短距離をBFSで計算する
	void bfs(int s) {
		std::fill(level.begin(), level.end(), -1);
		std::queue<int> queue;
		level[s] = 0;
		queue.push(s);
		while (!queue.empty()) {
			int v = queue.front(); queue.pop();
			for (int i = 0; i < graph[v].size(); ++i) {
				Edge& e = graph[v][i];
				if (e.cap > 0 && level[e.to] < 0) {
					level[e.to] = level[v] + 1;
					queue.push(e.to);
				}
			}
		}
	}

	// 増加パスをDFSで探す
	inline int dfs(int v, int t, int f) {
		if (v == t) return f;
		for (int& i = iter[v]; i < graph[v].size(); ++i) {
			Edge& e = graph[v][i];
			if (e.cap > 0 && level[v] < level[e.to]) {
				int d = dfs(e.to, t, std::min(f, e.cap));
				if (d > 0) {
					e.cap -= d;
					graph[e.to][e.rev].cap += d;
					return d;
				}
			}
		}
		return 0;
	}

	// sからtへの最大流を求める
	int maxFlow(int s, int t) {
		int res = 0;
		while (true) {
			bfs(s);
			if (level[t] < 0) return res;
			std::fill(iter.begin(), iter.end(), 0);
			int f;
			while ((f = dfs(s, t, (1LL << 31) - 1)) > 0) {
				res += f;
			}
		}
	}
};

int pos, as;
Dinic dn = Dinic(1);
void add(int a, int b, int p, int l, int r) {
	if (r <= a || b <= l) return;
	if (a <= l && r <= b) {
		dn.addEdge(as + pos, p, 1);
	}
	else {
		add(a, b, 2 * p + 1, l, (l + r) / 2);
		add(a, b, 2 * p + 2, (l + r) / 2, r);
	}
};

int slowcalc(int n, int m, V<int> l, V<int> r) {
	as = std::pow(2, std::ceil(std::log(m + 2) / std::log(2)) + 1) - 1;
	dn = Dinic(as + 2 + n);
	REP(i, (as + 1) / 2 - 1) {
		dn.addEdge(i, i * 2 + 1, 200005);
		dn.addEdge(i, i * 2 + 2, 200005);
	}
	REP(i, m) {
		int p = (as + 1) / 2 + i;
		dn.addEdge(p, n + as + 1, 1);
	}
	REP(i, n) {
		dn.addEdge(n + as, as + i, 1);
	}
	REP(i, n) {
		pos = i;
		add(0, l[i] + 1, 0, 0, (as + 1) / 2);
		add(r[i], m + 2, 0, 0, (as + 1) / 2);
	}
	int t = dn.maxFlow(n + as, n + as + 1);
	return n - t;
}

int mycalc2(int n, int m, V<int> l, V<int> r) {
	LazySegmentTree<MonoidOfValue::max<int>, MonoidOfOperator::add<int>, ApplyOperator::RMQRAQ> lst(m + 2);
	VV<int> L(m + 2);
	REP(i, n) L[r[i]].emplace_back(l[i]);
	lst.update(0, m + 2, -lst.query(0, 1));
	FOR(i, 1, m + 2) lst.update(i, i + 1, -i);
	lst.update(m + 1, m + 2, 1);

	int ans = 0;
	RREP(i, m + 2) {
		for (auto& l : L[i]) {
			lst.update(l, m + 2, 1);
		}
		CHMAX(ans, lst.query(0, m + 2));
		lst.update(0, i - 1, -1);
	}
	return ans;
}

signed main() {
	INIT;

	if (1) {
		VAR(int, n, m);
		VEC_ROW(int, n, l, r);

		OUT(mycalc2(n, m, l, r))BR;
		return 0;
	}

	int n = 10, m = 3;
	auto system_now = std::chrono::system_clock::now();
	std::mt19937 mt(std::chrono::duration_cast<std::chrono::microseconds>(system_now.time_since_epoch()).count());
	std::uniform_int_distribution<> rand(/* min */0, /* max */m + 1);

	while (true) {
		V<int> l(n), r(n);
		REP(i, n) {
			l[i] = rand(mt), r[i] = rand(mt);
			while (l[i] == r[i]) r[i] = rand(mt);
			if (l[i] > r[i]) std::swap(l[i], r[i]);
		}
		int mya = mycalc2(n, m, l, r);
		int sla = slowcalc(n, m, l, r);

		if (mya != sla) {
			SHOWVECTOR(l);
			SHOWVECTOR(r);
			SHOW(mya);
			SHOW(sla);
			VAR(int, x);
		}
	}


	return 0;
}

Measured memory_bytes: 23424