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

ans = "Yes"
cnt = 0
for i in range(1, N + 1)[::-1]:
    if (A[i - 1] + cnt) % i:
        ans = "No"
        break
    if A[i - 1] >= 1:
        cnt += 1

print(ans)