import java.util.*;

public class Main{
    public static void main(String[]args){
        Scanner sc = new Scanner(System.in);
        int N,i;
        N = sc.nextInt();
        int arr[] = new int[N];
        if(-100<=N<=100){
            System.out.println("Invalid input");
            return;
        }
        for(i=0;i<N;i++)
          arr[i] =  sc.nextInt();
          
        for(i=0;i<N/2;i++){
            if(arr[i]!=arr[N-1-i]){
                System.out.println("NO");
                  return;
            }
        }
        System.out.print("YES");
    }
}