#include <fstream>

using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int i,nr,n,j;
int cmmdc(int a,int b)
{
    int r=0;
    while(b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    f>>n;
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=n;j++)
        {
            if(cmmdc(i,j)==1)
                nr++;
        }
    }
    g<<nr;
    return 0;
}