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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.     long long f=1;
  10.     while(f<=n)
  11.     {
  12.         sum-=2*f;
  13.         f*=2;
  14.     }
  15.     cout << sum << endl;
  16.  
  17.  
  18. }
  19.  
  20.  
  21.  
  22.  
Success #stdin #stdout 0.01s 5304KB
comments (?)
stdin 
1000000000
stdout 
-2390792958
https://ideone.com/1C7i07
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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