func_code_string: #include <bits/stdc++.h>   #pragma GCC target( avx,tune=native )   using namespace std;   bitset<300000013> unprime;   int main() {     if (fopen( FILENAME.in ,  r )) {       freopen( FILENAME.in ,  r , stdin);       freopen( FILENAME.out ,  w , stdout);     }     ios_base::sync_with_stdio(false);     cin.tie(NULL);     long long l, r;     cin >> l >> r;     unprime[0] = 1;     unprime[1] = 1;     for (int i = 2; i <= r; i++) {       if (unprime[i]) continue;       if (i < 20000) {         for (int j = i * i; j <= r; j += i) {           unprime[j] = 1;         }       }     }     int answer = (l <= 2 && 2 <= r ? 1 : 0);     int temp = l % 4;     for (int i = l; i <= r; i++) {       if (!unprime[i] && temp == 1) answer++;       temp++;       if (temp == 4) temp = 0;     }     cout << answer << endl;   }   