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