#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("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,i,j,c=0;;
    f>>n;
    for(i=1;i<=n;++i)
    {
        for(j=1;j<=n;++j)
        {
            if(cmmdc(i,j)==1)
                c++;
        }
    }
    g<<c;
}