mod = 10 ** 9 + 7

N = int(input())
A = list(map(int, input().split()))
sq = int(N ** 0.5) + 1
sq = min(sq, 77)

dp = [0] * (N + 1)
memo = [[0] * N for _ in range(sq+1)]
dp[0] = 1
for i in range(N):
    a = A[i]
    for j in range(1, sq + 1):
        if i - j >= 0:
            memo[j][i] += memo[j][i-j]
            memo[j][i] %= mod
        dp[i] += memo[j][i]
        dp[i] %= mod

    if a > sq:
        for j in range(i + a, N, a):
            dp[j] += dp[i]
            dp[j] %= mod
    else:
        memo[a][i] += dp[i]
        memo[a][i] %= mod

    if a > 1:
        dp[i+1] += dp[i]
        dp[i+1] %= mod

print(dp[N-1])