#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int n,i,j,nr;
int cmmdc(int x, int y)
{
    int r;
    while(y)
    {
        r=y;
        y=x%y;
        x=r;
    }
    return x;
}
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;
}