mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

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

    block_size = 320
    add = [[0] * i for i in range(block_size+1)]

    ans = [0] * N
    ans[0] = 1
    for i, a in enumerate(A):
        for d in range(1, block_size+1):
            ans[i] = (ans[i] + add[d][i % d])%mod
        if a <= block_size:
            add[a][i%a] = (add[a][i%a] + ans[i])%mod
        else:
            for j in range(1, N+1):
                if i+j*a >= N:
                    break
                ans[i+j*a] = (ans[i+j*a] + ans[i])%mod
        if a != 1 and i+1 != N:
            ans[i+1] = (ans[i+1] + ans[i])%mod
    print(ans[-1])


if __name__ == '__main__':
    main()