#include <fstream>

using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int n,i,j,z,r;
int euclid(int x,int y)
{
    for(;y;)
    {
        r=x%y;
        x=y;
        y=r;
    }
    if(x==1)
        return 1;
    else
        return 0;
}
int main()
{
    fin>>n;
    for(i=1;i<=n;i++)
        for(j=1;j<=n;j++)
            if(euclid(i,j))
                z++;
    fout<<z;
    return 0;
}