#include <fstream>
using namespace std;
int cmmdc(int a,int b)
{
    while(a!=b)
        if(a>b)
            a=a-b;
        else
            b=b-a;
    return a;
}
int main()
{
    int n,i,j,c=1;
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    f>>n;
    for(i=1;i<=n;i++)
        for(j=1;j<=n;j++)
            {
                if(cmmdc(i,j)==1 && i!=j)
                    c++;
            }
    g<<c;
    return 0;
}