//#pragma GCC optimize ("O2")
//#pragma GCC target ("avx2")
#include<bits/stdc++.h>
//#include<atcoder/all>
//using namespace atcoder;

using namespace std;
typedef long long ll;
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep1(i, n) for(int i = 1; i <= (n); i++)
#define co(x) cout << (x) << "\n"
#define cosp(x) cout << (x) << " "
#define ce(x) cerr << (x) << "\n"
#define cesp(x) cerr << (x) << " "
#define pb push_back
#define mp make_pair
#define chmin(x, y) x = min(x, y)
#define chmax(x, y) x = max(x, y)
#define Would
#define you
#define please

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);


	int N;
	cin >> N;
	const int mod = 1e9 + 7;

	int dp[100001] = {};
	int are[101][101] = {};
	dp[0] = 1;
	rep(i, N - 1) {
		int a;
		cin >> a;

		int tmp = 0;
		rep1(j, 100) {
			tmp = (tmp + are[j][i % j]) % mod;
		}
		dp[i] = (dp[i] + tmp) % mod;

		if (a <= 100) are[a][i % a] = (are[a][i % a] + dp[i]) % mod;
		else {
			for (int j = i + a; j <= N; j += a) dp[j] = (dp[j] + dp[i]) % mod;
		}
		if (a != 1) dp[i + 1] = (dp[i + 1] + dp[i]) % mod;
	}

	int tmp = 0;
	rep1(j, 100) {
		tmp = (tmp + are[j][(N - 1) % j]) % mod;
	}
	dp[N - 1] = (dp[N - 1] + tmp) % mod;
	co(dp[N - 1]);

	Would you please return 0;
}