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artemgf Jun 13th, 2018 54 Never
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  1. #pragma once
  2. #define _CRT_SECURE_NO_WARNINGS
  3. #define _USE_MATH_DEFINES
  4. #include <iostream>
  5. #include <string>
  6. #include <map>
  7. #include <set>
  8. #include <algorithm>
  9. #include <vector>
  10. #include <stdio.h>
  11. #include <cmath>
  12. #include <math.h>
  13. #include <queue>
  14. #include <stack>
  15. #include <climits>
  16. #include <deque>
  17. #include <ctime>
  18. #include <iomanip>
  19. #include <bitset>
  20. #include <unordered_map>
  21. #include <unordered_set>
  22.  
  23. using namespace std;
  24.  
  25. typedef long long ll;
  26. typedef unsigned long long ull;
  27. typedef unsigned int ui;
  28.  
  29. #define mh() make_heap()
  30. #define poph() pop_heap()
  31. #define pushh() push_heap()
  32. #define sor(n) n.begin(), n.end()
  33. #define rsor(n) n.rbegin(), n.rend()
  34. #define mp make_pair
  35. #define files freopen("input.txt", "rt", stdin); freopen("output.txt", "wt", stdout)
  36. #define p(T) pair<T,T>
  37. #define toch(x) cout.precision(x), cout.setf(ios::fixed)
  38. #define znac(l) abs(l)/l
  39. #define IOS ios::sync_with_stdio(false)
  40. #define IOSB cin.tie(0), cout.tie(0);
  41. const ll ok = ll(1e9 + 7);
  42.  
  43. int main()
  44. {
  45.     IOSB;
  46.     IOS;
  47. #ifdef TheCompiler
  48.     files;
  49. #endif
  50.     ll n;
  51.     cin >> n;
  52.     ll l = 2;
  53.     while (n % (l + 1) != 0)
  54.     {
  55.         if (l > sqrt(n))
  56.         {
  57.             if (n % 2 == 0)
  58.             {
  59.                 l = n / 2 - 1;
  60.             }
  61.             else
  62.             l = n - 1;
  63.             break;
  64.         }
  65.         l++;
  66.     }
  67.     cout << l;
  68.     return 0;
  69. }
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