#include <bits/stdc++.h>
    using namespace std;
    #include <math.h>
    #include <iomanip>
    #include <cstdint>
    #include <string>
    #include <sstream>
    template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
    template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
    #define rep(i,n) for (int i = 0; i < (n); ++i)
    typedef long long ll;
    using P = pair<ll,ll>;
    const int INF=1001001001;
    const int mod=1e9+7;

    int main() {
      int N,X;
      cin>>N>>X;
      int mx=0,mn=INF;
      rep(i,N){
        int c;cin>>c;
        chmin(mn,c);
        chmax(mx,c);
      }
      if(mn<=X&&mx>=X){cout<<"Yes"<<endl;}
      else{cout<<"No"<<endl;}
      return 0;
    }