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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.  
  6.     int n ;
  7.     cin >>n;
  8.     long long sum = n*(n+1)/2;
  9.     int f=1;
  10.     while(f<=n)
  11.     {
  12.         sum-=(f*2);
  13.  
  14.         f*=2;
  15.     }
  16.     cout << sum << endl;
  17.  
  18.  
  19. }
  20.  
  21.  
  22.  
  23.  
  24.  
  25.  
Success #stdin #stdout 0s 5316KB
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https://ideone.com/pR2MZn
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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