func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int i, j, k, n, day, ans, flag;     cin >> n;     long long int a[n];     for (i = 0; i < n; i++) cin >> a[i];     sort(a, a + n);     day = 1;     ans = 0;     j = 0;     while (1) {       flag = 0;       for (i = j; i < n; i++) {         if (a[i] >= day) {           j = i + 1;           flag = 1;           ans++;           break;         }       }       if (flag == 0) break;       day++;     }     cout << ans <<   n ;     return 0;   }   