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

#define ALL(a)  (a).begin(),(a).end()
#define ALLR(a)  (a).rbegin(),(a).rend()
#define spa << " " <<
#define lfs <<fixed<<setprecision(10)<<
#define test cout<<"test"<<endl;
#define fi first
#define se second
#define MP make_pair
#define PB push_back
#define EB emplace_back
#define rep(i,n,m) for(ll i = n; i < (ll)(m); i++)
#define rrep(i,n,m) for(ll i = n - 1; i >= (ll)(m); i--)
typedef long long ll;
typedef long double ld;
const ll MOD = 1e9+7;
//const ll MOD = 998244353;
const ll INF = 1e18;
using P = pair<ll, ll>;
template<typename T>
void chmin(T &a,T b){if(a>b)a=b;}
template<typename T>
void chmax(T &a,T b){if(a<b)a=b;}
void pmod(ll &a,ll b){a=(a+b)%MOD;}
void pmod(ll &a,ll b,ll c){a=(b+c)%MOD;}
void qmod(ll &a,ll b){a=(a*b)%MOD;}
void qmod(ll &a,ll b,ll c){a=(b*c)%MOD;}
ll median(ll a,ll b, ll c){return a+b+c-max({a,b,c})-min({a,b,c});}
void ans1(bool x){if(x) cout<<"Yes"<<endl;else cout<<"No"<<endl;}
void ans2(bool x){if(x) cout<<"YES"<<endl;else cout<<"NO"<<endl;}
void ans3(bool x){if(x) cout<<"Yay!"<<endl;else cout<<":("<<endl;}
template<typename T1,typename T2>
void ans(bool x,T1 y,T2 z){if(x)cout<<y<<endl;else cout<<z<<endl;}  
template<typename T>
void debug(vector<vector<T>>v,ll h,ll w){for(ll i=0;i<h;i++)
{cout<<v[i][0];for(ll j=1;j<w;j++)cout spa v[i][j];cout<<endl;}};
void debug(vector<string>v,ll h,ll w){for(ll i=0;i<h;i++)
{for(ll j=0;j<w;j++)cout<<v[i][j];cout<<endl;}};
template<typename T>
void debug(vector<T>v,ll n){cout<<v[0];
for(ll i=1;i<n;i++)cout spa v[i];cout<<endl;};
template<typename T>
vector<vector<T>>vec(ll x, ll y, T w){
  vector<vector<T>>v(x,vector<T>(y,w));return v;}
ll gcd(ll x,ll y){ll r;while(y!=0&&(r=x%y)!=0){x=y;y=r;}return y==0?x:y;}
template<typename T>
void emp(map<T,ll>&m, T x){m.emplace(x,0).first->second++;}
vector<ll>dx={1,0,-1,0,1,1,-1,-1};
vector<ll>dy={0,1,0,-1,1,-1,1,-1};

struct SCC{
  ll n;
  vector<vector<ll>>G,Gr;
  vector<ll>index;//各ノードが属する強連結成分の番号
  vector<ll>ret;//dfsに使う
  SCC(vector<vector<ll>>g):G(g),n(g.size()){
    index.assign(n,-1LL);
    build();
  }
  void build(){
    Gr.assign(n,vector<ll>());
    for(ll i=0;i<n;i++){
      for(ll j=0;j<G[i].size();j++){
        Gr[G[i][j]].push_back(i);
      }
    }
    for(ll i=0;i<n;i++)if(index[i]==-1)dfs1(i);
    fill(ALL(index),-1);
    ll cnt=0;
    reverse(ALL(ret));
    for(ll i=0;i<n;i++){
      if(index[ret[i]]==-1){
        dfs2(ret[i],cnt);
        cnt++;
      }
    }
  }
  void dfs1(ll k){
    index[k]=1;
    for(ll i=0;i<G[k].size();i++){
      if(index[G[k][i]]==-1)dfs1(G[k][i]);
    }
    ret.push_back(k);
  }
  void dfs2(ll k, ll idx){
    index[k]=idx;
    for(ll i=0;i<Gr[k].size();i++){
      if(index[Gr[k][i]]==-1)dfs2(Gr[k][i],idx);
    }
  }
  vector<ll>output(){return index;};
};

int main(){
  cin.tie(NULL);
  ios_base::sync_with_stdio(false);
  ll res=0,res1=INF,res2=-INF,buf=0;
  bool judge = true;
  ll n,m;cin>>n>>m;
  vector<vector<ll>>g(2*n);
  vector<ll>l(n),r(n);
  rep(i,0,n)cin>>l[i]>>r[i];
  rep(i,0,n)rep(j,i+1,n){
    if(l[i]<=r[j]&&r[i]>=l[j]){
      g[i].PB(j+n);
      g[j].PB(i+n);
    }
    if(m-1-l[i]<=l[j]&&m-1-r[i]>=r[j]){
      g[i+n].PB(j+n);
      g[j+n].PB(i+n);
    }
    if(l[i]<=m-1-l[j]&&r[i]>=m-1-r[j]){
      g[i].PB(j);
      g[j].PB(i);
    }
    if(m-1-r[i]<=m-1-l[j]&&m-1-l[i]>=m-1-r[j]){
      g[i+n].PB(j);
      g[j+n].PB(i);
    }
  }
  SCC scc(g);
  auto idx=scc.output();
  rep(i,0,n){
    if(idx[i]==idx[i+n])judge=false;
  }
  ans2(judge);
  return 0;
}