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

if N <= 1:
    exit(print("Yes"))
if sum(A[1:]) == 0:
    exit(print("Yes"))

SUM = 2
for i in range(2, N+1):
    SUM += (i-2)*A[i]

print("Yes" if SUM <= A[1] else "No")