N=int(input())
A=[0]+list(map(int,input().split()))
S=301
C=[[0]*i for i in range(S)]
DP=[0]*(N+2)
mod=10**9+7
DP[1]=1
for i in range(1,N+1):
  for j in range(1,S):
    DP[i]+=C[j][i%j]
    if DP[i]>=mod:
      DP[i]-=mod
  if A[i]<S:
    m=i%A[i]
    C[A[i]][m]+=DP[i]
    if C[A[i]][m]>=mod:
      C[A[i]][m]-=mod
  else:
    for j in range(i+A[i],N+1,A[i]):
      DP[j]+=DP[i]
      if DP[j]>=mod:
        DP[j]-=mod
  if A[i]>1:
    DP[i+1]+=DP[i]
  if DP[i+1]>=mod:
    DP[i+1]-=mod
print(DP[N])