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  1. #include <bits/stdc++.h>
  2. #define VuDucNam ios_base::sync_with_stdio(false);
  3. #define Lop9a6 cin.tie(NULL);
  4. #define THCSPhamVanDong cout.tie(NULL);
  5. #define ll long long
  6. #define el cout << '\n'
  7. #define sz(a) (ll) a.size()
  8. #define all(a) a.begin(), a.end()
  9. #define fi first
  10. #define se second
  11. #define fill(a, x) memset(a, x, sizeof(a))
  12. #define file(name)                         \
  13.     if (fopen(name ".inp", "r"))           \
  14.     {                                      \
  15.         freopen(name ".inp", "r", stdin);  \
  16.         freopen(name ".out", "w", stdout); \
  17.     }
  18. #define TIME (1.0 * clock() / CLOCKS_PER_SEC)
  19. #define RUNTIME cerr << "\nRuntime: " << TIME << "s.\n"
  20.  
  21. using namespace std;
  22.  
  23. const ll MOD = 1e9 + 7;
  24. const ll inf = LLONG_MAX;
  25.  
  26. ll k;
  27. long double ans;
  28.  
  29. void solve()
  30. {
  31.     cin >> k;
  32.     ans = 0.5 / (1 - 1.0/2*k+3);
  33.     cout << fixed << setprecision(2) << ans;
  34.     el;
  35. }
  36.  
  37. int main()
  38. {
  39.     VuDucNam Lop9a6 THCSPhamVanDong
  40.     // file();
  41.     solve();
  42.     RUNTIME;
  43.     return 0;
  44. }
Success #stdin #stdout #stderr 0s 5284KB
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stdin
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Standard input is empty
stdout
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0.12
stderr
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Runtime: 0.004177s.
https://ideone.com/CKZ17R
language:
C++ (gcc 8.3)
created:
20 hours ago
visibility:
public

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