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  1. #include <bits/stdc++.h>
  2. #define ll long long
  3. using namespace std;
  4.  
  5.  
  6.  
  7. // binary search
  8.  
  9. int main() {
  10.     long long n;
  11.     cin >> n;
  12.  
  13.     ll l = 1, r  =1e13, mid, ans;
  14.     while (l <= r) {
  15.         mid = r + (l - r)/2;
  16.  
  17.         ll can  = 314ll * mid + 4;
  18.         if (can >= n) {
  19.             ans = mid;
  20.             r = mid - 1;
  21.         }
  22.         else {
  23.             l = mid + 1;
  24.         }
  25.  
  26.  
  27.     }
  28.     cout << ans << endl;
  29.  
  30. }
Success #stdin #stdout 0.01s 5316KB
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stdin 
Standard input is empty
stdout 
448188694613
https://ideone.com/idGr2z
language:
C++ (gcc 8.3)
created:
9 days ago
visibility:
public

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