func_code_string: #include <bits/stdc++.h>   using namespace std;   int32_t main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     long long n;     cin >> n;     long long l = 1, k = n, cnt = 0, h = n, ans = 0;     while (l <= h) {       long long mid = l + (h - l) / 2;       k = n;       cnt = 0;       while (k > 0) {         if (k >= mid) {           k = k - mid;           cnt += mid;           k = k - (k / 10);         } else {           cnt += k;           break;         }       }       if (cnt >= (n + 1) / 2) {         ans = mid;         h = mid - 1;       } else {         l = mid + 1;       }     }     cout << ans <<   n ;     return 0;   }   