func_code_string: #include <bits/stdc++.h>   using namespace std;   bool isPrime(long long n) {     if (n <= 1) return false;     for (int i = 2; i <= sqrt(n); i++)       if (n % i == 0) return false;     return true;   }   long long mod = 1000000007;   int main() {     long long i, j, k = 0, n, m = 0, a[300001], b[300001], t = 0, ans = 0, i1 = 0,                     i2, h, p1, p2 = 0, q, l, f, c[2], mi;     char c1, c2, d[1001][1001];     string s;     double j1;     string e, dz;     std::vector<pair<long long, long long>> vect;     vector<long long> v;     map<string, long long> m1;     map<string, long long>::iterator itr;     cin >> n;     for (i = 0; i < n; i++) {       cin >> a[i];     }     sort(a, a + n);     j = 1;     for (i = 0; i < n; i++) {       if (a[i] >= j) {         t++;         j++;       }     }     cout << t;   }   