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