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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4.  
  5. int main()
  6. {
  7.     ios::sync_with_stdio(false);
  8.     cin.tie(nullptr);
  9.     cout.tie(nullptr);
  10.  
  11.     ll n;
  12.     cin >> n;
  13.  
  14.     ll ans = 0, x = 1;
  15.  
  16.     for (ll i = 0; i < n; i++)
  17.     {
  18.         ans += x;
  19.         x *= 2;
  20.     }
  21.     cout << ans;
  22. }
Success #stdin #stdout 0.01s 5288KB
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1125899906842623
https://ideone.com/83nFj2
language:
C++14 (clang 8.0)
created:
11 days ago
visibility:
public

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