#include <fstream>

using namespace std;
ifstream in("fractii.in");
ofstream out("fractii.out");
int cmmdc(int a,  int b)
{
    int r;
    while(b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int NON(int a)
{
    int i,j,sum=0;
        for(i=1; i<=a; i+=1)
        {
            for(j=1; j<=a; j++)
            {
                if(cmmdc(i,j)==1)
                    sum++;
            }

        }

    return sum;
}
int main()
{
    int a;
    in>>a;
    out<<NON(a);
    return 0;
}