import java.util.*;
class Main{
    public static void main(String args[]){
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        if(n<=0 ||n>=1000){
            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 st=0;
        int e=a.length-1;
        while(st<e){
            int temp=a[s];
            a[s]=a[e];
            a[e]=temp;
            s++;
            e--;
        }
        for(int i=0;i<n;i++){
            if(a[i]!=a1[i]){
                System.out.println("No");
                return;
            }
        }
        System.out.println("Yes");
    }
}