N = int(input())
A = list(map(int, input().split()))

cnt = 0
ac = [0]*(N+1)
for i in range(N-1, -1, -1):
    if i < N-1: 
        ac[i] += ac[i+1]
    cnt = A[i] + ac[i+1]
    if A[i] > i+1 or cnt % (i+1) != 0:
        print('No')
        exit()
    if cnt != 0:
        m = cnt//(i+1)
        ac[i] += m

print('Yes')