#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: wangyiyang
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/