func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long int N = 200010;   const long long mod = 1000000007;   const long long inf = 1000000000000000000;   const long double pi = 3.14159265358979323846264338;   signed main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     long long int n;     cin >> n;     vector<long long int> a(n);     for (long long int i = 0; i < n; i++) {       cin >> a[i];     }     sort((a).begin(), (a).end());     long long int ans = 0, cnt = 1;     for (long long int i = 0; i < n; i++) {       if (a[i] >= cnt) ans++, cnt++;     }     cout << ans;     return 0;   }   