n = int(input())
a = [0] + list(map(int,input().split()))

cnt = 0
for i in range(n,0,-1):
    ai = a[i]
    if(ai > i):
        print('No')
        exit()
    ai += cnt
    if(ai % i != 0):
        print('No')
        exit()
    cnt += ai//i

print('Yes')