#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int cmmdc(int a,int b)
{
    while(a!=b)
    {
        if(a>b)
            a=a-b;
        else
            b=b-a;
    }
    return a;
}
int main()
{
    int n,nr=0,a,b;
    fin>>n;
    for(int i=1;i<=n;i++)
        {
            for(int j=1;j<=n;j++)
                if(cmmdc(i,j)==1)
                    nr++;
        }
    fout<<nr;
    return 0;
}