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

typedef modint998244353 mint;
typedef long long ll;

int main(){
	int n, m; cin >> n >> m;
	scc_graph scc(2*n);
	vector<int> l(2*n), r(2*n);
	for (int i=0; i<n; i++){
		cin >> l[i] >> r[i];
		l[i+n] = m-1-r[i];
		r[i+n] = m-1-l[i];
	}

	for (int i=0; i<2*n; i++){
		for (int j=i+1; j<2*n; j++){
			if (min(r[i], r[j]) - max(l[i], l[j]) > 0){
				scc.add_edge(i, (n+j)%(2*n));
				scc.add_edge(j, (n+i)%(2*n));
			}
		}
	}

	vector<vector<int>> g = scc.scc();
	vector<int> moto(2*n);
	for (int i=0; i<g.size(); i++){
		for (int j: g[i]){
			moto[j] = i;
		}
	}

	for (int i=0; i<n; i++){
		if (moto[i] == moto[n+i]){
			cout << "NO" << endl;
			return 0;
		}
	}

	cout << "YES" << endl;
}