#include<bits/stdc++.h>
using namespace std;


int main() {
	int n,a[20],p;
	cin>>n;
	int i;
	for(i = 0; i < n; i++) {
		cin>>a[i];
	}
	for(i = 0;i < n / 2;i++){
		if(a[i] != a[n - i - 1]){
			cout<<"NO";
			return 0;
		}
	}
	
	cout<<"YES";
}

/**************************************************************
	Problem: 1817
	User: admin
	Language: C++
	Result: Accepted
	Time:21 ms
	Memory:2072 kb
****************************************************************/