#include <fstream>

using namespace std;

ifstream fin("fractii.in");
ofstream fout("fractii.out");

int n,i,j,k;

int CMMDC(int a, int b)
{
    while(a!=b)
        if(a>b) a=a-b;
        else b=b-a;
    return b;
}

int main()
{
    fin>>n;
    for(i=1;i<=n;i++)
    {
        j=1;
        while(j<=n)
        {
            if(CMMDC(i,j)==1)
                k++;
            j++;
        }
    }
    fout<<k;
    return 0;
}