#include<fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");

int cmmdc(int a,int b)
{
    int r,aux;
    if(a<b)
    {
        aux=a;
        a=b;
        b=aux;
    }
    r=a%b;
    while(r!=0)
    {
        a=b;
        b=r;
        r=a%b;
    }
    return b;
}


int main()
{
    int n,i,j,k=0;
    f>>n;
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=n;j++)
        {
            if(cmmdc(i,j)==1)
                k++;
        }
    }
    g<<k;
    return 0;
}