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

int rastojanie(int a, int b) {
    return abs(a-b);
}

string levo_ili_desno(pair<int,int> platforma, pair<int,int> otsecka) {

if(otsecka.first<platforma.first) {
        return "levo";
    }

return "desno";

}

int main(){
    int N,L;
    pair<int,int> platforma;
    cin>>N>>L;
    vector<pair<int,int>> otsecka;
    platforma.first = 0;
    platforma.second = L;
   
    for(int i = 0; i<N; i++){
        int x,y;
        cin>>x>>y;
        otsecka.push_back(make_pair(x,y));
    }

int brojac = 0;

for(int i = 0; i<N; i++) {

if(otsecka[i].first<platforma.first and otsecka[i].second>platforma.second) {
           continue;
        }
        if(otsecka[i].first>=platforma.first and otsecka[i].second<=platforma.second) {
            brojac++;
        }
        else {
            if(levo_ili_desno(platforma,otsecka[i])=="levo") {
                if(rastojanie(platforma.first,otsecka[i].second)>=rastojanie(platforma.first,otsecka[i].first)) {
                    brojac++;
                    platforma.first = otsecka[i].first;
                }
            }
            else {
                if(rastojanie(otsecka[i].first,platforma.second)>=rastojanie(otsecka[i].second,platforma.second)) {
                    brojac++;
                    platforma.second = otsecka[i].second;
                }
            }
        }
    }
    cout<<brojac;

}