import java.util.*;
class Main{
    public static void main(String[]args){
     Scanner sc=new Scanner(System.in);
     int n=sc.nextInt();
     int[]a=new int[n];
     if(n<0)
     {
         System.out.println("Invalid input");
         return;
     }
     int[]a=new int[n];
    for(int i=0;i<n;i++)
   {
     a[i]=sc.nextInt();
   }
  int[]a1=new int[n];
  for(int i=0;i<n;i++)
  {
     a1[i]=a[i];
  }
  System.out.println();
  int start=0;
     int end=a.length-1;
     while(start<end)
     {
     int temp=a[start];
     a[start]=a[end];
     start++;
     end--;
     }
     for(int i=0;i<n;i++)
     {
         if(a[i]!=a1[i])
         {
            System.out.println("No");
            return;
         }
     }
     System.out.println("Yes");
    }
}