#include <fstream>
using namespace std;
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()
{
    int n,i,j;
    fin>>n;
    int a=0;
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=n;j++)
        if(euclid(i,j)==1)
        a++;

    }
    fout<<a;
    return 0;
}