#include <fstream>

using namespace std;
int cmmdc(int a,int b)
{
    int r;
    while(b!=0)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    int n,fr,i,j;
    f>>n;
    fr=2*n-1;
    for(i=2;i<=n;i++)
    {
        for(j=2;j<=n;j++)
        {
            if(cmmdc(i,j)==1)  fr++;
        }
    }
    g<<fr;
    return 0;
}