# t = int(input())
# n = int(input())
# a = list(map(int,input().split()))
# a,b,c = map(int,input().split())
#By Tahir Huzaifa
n = int(input())
a = list(map(int,input().split()))

st = 0
end = n-1
s = a[st] + a[end]
# print(s)
st+=1
end-=1
f = True
while st<=end:
    if s!= (a[st]+a[end]):
        # print(s)
        f=False
        break
    st+=1
    end-=1
if f:
    print("YES")
else:
    print("NO")