#include<iostream>
#include<string>
using namespace std;

int main(){
	int n;
	cin>>n;
	int arr[n],found=0;
	for(int i =0;i<n;i++){
		cin>>arr[i];
	}
	
	for(int i=0;i<n/2;i++){
		if (arr[i]==arr[n-i-1]){
			 found = 1;
		}
		else {
			found = 0;
		}
		
	}
	if (found){
		cout<<"YES"<<endl;
	}	
	else cout<<"NO"<<endl;
	return 0;
	
}