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/*
* Written by Nitin Kumar Maharana
* [email protected]
*/
#include <iostream>
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;
}