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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.  
  6.     double n,x ;
  7.     cin >> n;
  8.  
  9.     long long  sum =0 ;
  10.     for (int i=1 ; i<=n ; i++)
  11.     {    
  12.     x = pow(2,i);
  13.      sum+=x ; 
  14.        }
  15.         cout << sum  << endl;
  16.  
  17.     return 0;
  18.     }
Success #stdin #stdout 0s 5320KB
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https://ideone.com/RgsEn9
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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