using System;
public class MainClass
{
public static void Main()
int num = Convert.ToInt32(Console.ReadLine());
string numLine = Console.ReadLine();
string [] numArray = numLine.Split (' ');
string array1 = " ";
string arrayBack = " ";
for (int i=0;i<num;i++)
array1 = numArray [i];
}
for (int i=num-1; i>=0; i--)
arrayBack = numArray [i];
if (array1==arrayBack)
Console.Write("YES");
else
Console.Write("NO");