#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int n,i,j,nr;
int main()
{f>>n;
for(i=1;i<=n;i++)
    for(j=1;j<=n;j++)
        {if(i%j!=0||j==1&&j!=i)
            nr++;

        }

    g<<nr;
    return 0;
}