#include <iostream>
using namespace std;
 
int main()
{
    int n;
    cin >> n;
    int count = 0;
    for (int a = 1; a < n; a++)
    {
        for (int b = a + 1; b <= n; b++)
        {
            if ((a + b) %!(a * b) == 0)
            {
                count++;
            }
        }
    }
    cout << count << endl;
    return 0;
}