#include <bits/stdc++.h> using namespace std; using LL=long long; using ULL=unsigned long long; #define rep(i,n) for(int i=0; i<(n); i++) int N,X; int l=100,r=0; int main(){ cin>>N>>X; rep(i,N){ int a; cin>>a; l=min(l,a); r=max(r,a); } if(l<=X&&X<=r) cout<<"Yes"<<endl; else cout<<"No"<<endl; return 0; }