#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    ifstream fin("fractii.in");
    ofstream fout("fractii.out");
    int i,n,j,nr=0;
    fin>>n;
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=n;j++)
        {
            if((i%j!=0&&j%i!=0) || j==1 || i==1)
            {
                //cout<<i<<"/"<<j<<" ";
                nr++;
            }
        }
    }
    cout<<nr;

    fin.close();
    fout.close();
    return 0;
}