#include <fstream>
using namespace std;

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

int cmmdc(int, int);
int n,i,j,c;

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

int cmmdc(int a,int b)
{
    int r;
    do
    {
        r = a%b;
        a = b;
        b = r;
    }
    while(r!=0);
    if(a>1)
        return a;
    else return 1;
}