func_code_string: #include <bits/stdc++.h>   using namespace std;   long long add(long long a, long long b) {     a += b;     if (a >= 1000000007) {       a -= 1000000007;     }     return a;   }   long long sub(long long a, long long b) {     a -= b;     if (a < 0) {       a += 1000000007;     }     return a;   }   long long mul(long long a, long long b) { return (a * b) % 1000000007; }   void add_self(long long& a, long long b) { a = add(a, b); }   void sub_self(long long& a, long long b) { a = sub(a, b); }   void mul_self(long long& a, long long b) { a = mul(a, b); }   const long long MAXN = 200010;   long long get(long long val, long long tot) {     long long ans = 0;     long long L = val, R = val + 1 - (val % 2);     while (R <= tot) {       ans += R - L + 1;       L = 2 * L;       R = 2 * R + 1;     }     ans += max(0LL, tot - L + 1);     return ans;   }   int main() {     long long x, k;     cin >> x >> k;     long long lo = 0, hi = 1e18, ans = 0;     while (lo <= hi) {       long long mid = (lo + hi) / 2;       if (get(2 * mid + 1, x) >= k) {         ans = 2 * mid + 1;         lo = mid + 1;       } else {         hi = mid - 1;       }     }     lo = 0;     hi = 1e18;     while (lo <= hi) {       long long mid = (lo + hi) / 2;       if (get(2 * mid, x) >= k) {         ans = max(ans, 2 * mid);         lo = mid + 1;       } else {         hi = mid - 1;       }     }     cout << ans <<   n ;   }   