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