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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main()
  5. {
  6.     int n,i,sum;
  7.     cin>>n;
  8.     sum=n;
  9.     for(i=2;;i++)
  10.     {
  11.         if((i*i)<=n)
  12.          sum=sum+((n/i)-(i-1));
  13.          else 
  14.          break;
  15.     }
  16.     cout<<sum;
  17. 	return 0;
  18. }
  19.  
Success #stdin #stdout 0s 15224KB
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https://ideone.com/I1Q04L
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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