#include<iostream>
#include<fstream>
using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");

int cmmdc(int x,int y)
{
    if(!y)
        return x;
    else
        return cmmdc(y,x%y);
}

int main()
{
    int n,nr=0;
    fin >> n;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=n;j++)
            if(j==1||cmmdc(i,j)==1)
            nr++;
    }
    fout << nr;
    return 0;
}