#include <iostream>
#include <fstream>
using namespace std;

int main()
{
    int n,i,j,nr=0,v[2425];
    ifstream g("fractii.in");
    ofstream z("fractii.out");
    g>>n;

    for(i=1;i<=n;i++)
    {
        for(j=1;j<=n;j++)
        {
            if(i==1||j==1)
            nr++;
            else if (i%j!=0 && j%i!=0)
            nr++;
        }
    }
    z<<nr;
    return 0;
}