func_code_string: #include <bits/stdc++.h>   using namespace std;   long long pw(long long a, long long b, long long md) {     return (!b ? 1                : (b & 1 ? a * pw(a * a % md, b / 2, md) % md                         : pw(a * a % md, b / 2, md) % md));   }   const long long MOD = 1e9 + 7, MAXN = 1e6 + 10;   bool prime[MAXN];   long long n, ans, p;   int main() {     ios::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     ;     cin >> n;     for (long long i = 0; i < MAXN; i++) prime[i] = true;     for (int p = 2; p * p <= n; p++) {       if (prime[p] == true) {         for (int i = p * 2; i <= n; i += p) prime[i] = false;       }     }     for (long long i = 1; i <= n; i++) {       p = 0;       for (long long j = 2; j <= i; j++) {         if (i % j == 0 && prime[j]) p++;       }       if (p == 2) ans++;     }     cout << ans;     return 0;   }   