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

int i,j,n;

int cmmdc(int a,int b)
{
    int c;
    while (b)
    {
        c = a % b;
        a = b;
        b = c;
    }
    return a;
}

int fractii(int n)
{
    int x=0;
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=n;j++)
            if(cmmdc(i,j)==1)
                x++;
    }
    return x;
}

int main()
{
    in>>n;
    out<<fractii(n);
}