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