n = int(input())
a = list(map(int, input().split()))
x = a[0] + a[-1]
if n % 2 == 1:
    if float(a[n//2]) != x/2:
        print('No')
        exit()

for i in range(n//2):
    

    if a[i] + a[n-i-1] != x:
        print('No')
        exit()
print('Yes')