#include<bits/stdc++.h>
using namespace std;
int main(){

int arr[100], n,,key,i;

cin>>n;

for(i=0; i<n; i++)
    cin>>arr[i];
   cin>>key;

   for(i=0; i<n; i++)
   {
       if(arr[i]==key){
       cout<<"Yes"<<endl;
       break;
       }
   }

   if(arr[i]!=key)
    cout<<"NO"<<endl;

return 0;
}