func_code_string: #include <bits/stdc++.h>   using namespace std;   bitset<300000005> pr;   int uke[20000005];   int anti_uke(int l, int r) {     int ans = 0;     for (register int i = 5; i <= r; i += 4) {       if (i >= l && pr[i] == 0) ++ans;     }     if (l <= 2 && r >= 2) ++ans;     return ans;   }   int main() {     int l, r;     scanf( %d %d , &l, &r);     pr[0] = pr[1] = 1;     int cnt = 0;     for (register int i = 2; i <= r; i++) {       if (pr[i] == 0) uke[++cnt] = i;       for (register int j = 1; j <= cnt && i * uke[j] <= r; j++) {         pr[i * uke[j]] = 1;         if (i % uke[j] == 0) break;       }     }     printf( %d n , anti_uke(l, r));     return 0;   }   