N = int(input())
A = list(map(int, input().split()))
for i in range(N):
    if A[i] > i + 1:
        print("No")
        exit()
        
cnt = 0
for i in range(N - 1, -1, -1):
    if (cnt + A[i]) % (i + 1) != 0:
        print("No")
        exit()
    cnt += (A[i] + cnt) // (i + 1)
print("Yes")