#include<fstream>

using namespace std;
int s,n,i,j;

int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");

    f>>n;

    for(i=2;i<n;i++)
    for(j=i+1;j<=n;j++)
    if(j%i==0)
    s++;

    s=(n-1)*n-2*s+1;

    g<<s;
}