func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long maxx = 1e6 + 7;   const long long maxn = 1e6 + 7;   const long long mod = 998244353;   const long long maxs = 500000 + 7;   const long long maxm = 400000 + 7;   const long long maxk = 1008 + 7;   const long long maxw = 100 + 7;   const long long maxh = 100 + 7;   const double pi = 3.1415926;   const long long ten = 10;   const long long ooi = 1000000;   const long long ool = 1e18 + 7;   const long double eps = 1e-8;   const int apsz = 26;   int seq[maxn];   int n;   void init() {     cin >> n;     for (long long i = (1); i <= (n); i++) {       cin >> seq[i];     }     sort(seq + 1, seq + 1 + n);   }   void solve() {     int ans = 0;     int i = 1;     int nowd = 1;     while (i <= n) {       while (i <= n && seq[i] < nowd) i++;       if (i == n + 1) break;       ans++;       nowd++, i++;     }     cout << ans << endl;   }   int main(void) {     ios::sync_with_stdio(false);     cout.tie(0);     cin.tie(0);     init();     solve();     return 0;   }   