func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long n;     cin >> n;     long long cur = 1;     long long ans = 0;     long long now = n;     while (cur <= now) {       now -= cur;       cur *= 2;       ans++;     }     if (now != 0) ans++;     cout << ans << endl;     return 0;   }   