func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     vector<int> v(n);     int ans = 0, cnt = 0;     for (int i = 0; i < n; i++) {       cin >> v[i];     }     for (int i = 0; i < n; i++) {       if (v[i] == i)         ans++;       else if (v[v[i]] == i) {         cnt = 1;       }     }     cout << min(ans + cnt + 1, n);     return 0;   }   