func_code_string: #include <bits/stdc++.h>   #pragma warning(disable : 4996 4018)   using namespace std;   int n, mod = 1000000007;   long long arr[1001], cost[1001];   int main() {     cin.tie(0);     ios_base::sync_with_stdio(0);     cin >> n;     for (int i = 1; i <= n; i++) cin >> arr[i];     long long ans = 0;     for (int i = 1; i <= n; i++) {       for (int e = arr[i]; e != i; e++) cost[i] = (cost[i] + cost[e]) % mod;       cost[i] = (cost[i] + 2) % mod;       ans = (ans + cost[i]) % mod;     }     cout << ans <<   n ;     return 0;   }   