#include <fstream>
using namespace std;
int n,i,j,a=0;
ifstream fin ("fractii.in");
ofstream fout ("fractii.out");	
int euclid(int a, int b)
	
{
	int c;
	while (b) 
    {
	    c = a % b;
        a = b;
	    b = c;
	}
	 return a;
	
}

int main()
{
    fin>>n;
    for(i=1;i<=n;i++)
        for(j=1;j<=n;j++)
            if(euclid(i,j)==1)
                a++; 
    fout<<a;
    return 0;
}