func_code_string: #include <bits/stdc++.h>   using namespace std;   const int inf = 0x3f3f3f3f;   long long cal(long long x) { return (x + 1) * x / 2; }   int main() {     std::ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);     long long n;     cin >> n;     long long l = 0, r = 1e8, ans = -1;     while (l <= r) {       long long mid = (l + r) >> 1;       if (cal(mid) < n)         l = mid + 1, ans = mid;       else         r = mid - 1;     }     cout << n - cal(ans) <<   n ;     return 0;   }   