#include<bits/stdc++.h>
using namespace std;
using ll = long long int;
using ld = long double;
const ll MAX = 5000000000000000000;
ll MOD = 1000000007;
int main(){
    ll N,X;
    cin >> N >> X;
    if(N == 1){
        if(N == X) cout << "YEs\n";
        else cout << "No\n";
    }
    else{
        vector<ll> C(N);
        for(ll i = 0;i < N;i++) cin >> C[i];
        if(C[0] <= X && X <= C[N - 1]) cout << "Yes\n";
        else cout << "No\n";
    }
}