#include <bits/stdc++.h>
using namespace std;
/*
Coded by 秦惜梦
The most attractive girl in the world
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*/

int n,m;

struct point{
	int l,r;
	void read(){
		scanf("%d%d",&l,&r);
	}
	bool operator<(const point &pt){
		return l<pt.l;
	}
};

point a[200005];

int main(){
	scanf("%d%d",&n,&m);
	for(int i=1;i<=n;i++){
		a[i].read();
	}
	sort(a+1,a+n+1);
	int l=1;
	priority_queue<int,vector<int>,greater<int> > pq;
	vector<int> rs;
	for(int i=1;i<=n;i++){
		pq.push(a[i].r);
		if(l<=m&&a[i].l>=l){
			l++;
		}else{
			rs.push_back(pq.top());
			pq.pop();
		}
	}
	sort(rs.begin(),rs.end());
	int r=m;
	int ans=0;
	for(int i=rs.size()-1;i>=0;i--){
		if(r>=l&&rs[i]<=r){
			r--;
		}else{
			ans++;
		}
	}
	printf("%d\n",ans);
	return 0;
}

Measured memory_bytes: 3320