#include<iostream>
using namespace std;
#define rep(i,n)for(int i=0;i<(int)(n);++i)

int main(){
  int n,x;cin>>n>>x;
  int m=100,M=-1;
  rep(_,n){
    int c;cin>>c;m=min(m,c),M=max(M,c);
  }
  cout<<(m<=x&&x<=M?"Yes":"No")<<endl;
}