#include<bits/stdc++.h>
#pragma GCC target("avx")
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
using std::cin;
using std::cout;
#define endl "\n"
using std::vector;
constexpr int mod=1e9+7;
int main(){
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    int N; cin>>N;
    vector<int> dp(N);
    dp[0]=1;
    vector<int> A(N);
    for(int i=0;i<N;i++){
        cin>>A[i];
        if(i>0&&A[i-1]>1){
            dp[i]+=dp[i-1];
            if(dp[i]>=mod) dp[i]-=mod;
        }
        for(int j=i+A[i];j<N;j+=A[i]){
            dp[j]+=dp[i];
            if(dp[j]>=mod) dp[j]-=mod;
        }
    }
    cout<<dp[N-1]<<endl;
}