#include<bits/stdc++.h>
using namespace std;
int main(){ 
  int n; cin >> n; 
  vector<int> a(n); for(int i = 0; i < n; i++){ cin >> a[i];}
  
  if( a.front() < a.back()){ cout << "Yes" << endl;}
  else{ cout << "No" << endl;}
  
  return 0;
}