P = 10 ** 9 + 7
N = int(input())
A = [int(a) for a in input().split()]
X = [0] * N
X[0] = 1
K = 4
Y = [[0] * a for a in range(K)]

for i, a in enumerate(A):
    s = X[i] + X[i-1]
    if s >= P: s -= P
    for j in range(1, K):
        s += Y[j][i%j]
        if s >= P: s -= P
    X[i] = s
    if a < K:
        Y[a][i%a] += s
        if a == 1 and i < N - 1:
            X[i+1] -= s
    else:
        for j in range(i + a, N, a):
            X[j] += s
            if X[j] >= P: X[j] -= P
print(X[-1])