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