func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     scanf( %d , &n);     if (n == 1) {       cout << 0 << endl;       return 0;     }     int a[n + 2], cnt = n - 1;     for (int i = 2; i <= n; i++) {       a[i] = i;     }     for (int i = 2; i < n; i++) {       for (int j = i + 1; j <= n; j++) {         if (a[j] == 0) continue;         if (i * j <= n && j % i != 0) {           a[i * j] = 0;           cnt--;         }       }     }     cnt = 0;     for (int i = 2; i <= n; i++) {       if (a[i] != 0) {         cnt++;       }     }     cout << cnt << endl;     for (int i = 2; i <= n; i++) {       if (a[i] != 0) {         cout << a[i] <<    ;       }     }     printf(  n );     return 0;   }   