| /* | |
| * Written by Nitin Kumar Maharana | |
| * nitin.maharana@gmail.com | |
| */ | |
| using namespace std; | |
| int main(void) | |
| { | |
| int n; | |
| long result; | |
| cin >> n; | |
| result = 0l; | |
| result += n; | |
| for(int i = 2; i <= n/2; i++) | |
| { | |
| if(i*i <= n) | |
| result += (i-1); | |
| else | |
| { | |
| for(int j = 2; i*j <= n; j++) | |
| result++; | |
| } | |
| } | |
| cout << result << endl; | |
| return 0; | |
| } |