import sys
n=int(input())
s1=list(map(int,input().split()))
s2=s1[::-1]
for i in range(len(s1)):
    if s1[i]!=s2[i]:
        print("NO")
        sys.exit()
print("YES")
        

/**************************************************************
	Problem: 1817
	User: admin
	Language: Python
	Result: Accepted
	Time:138 ms
	Memory:34480 kb
****************************************************************/