#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,cnt=0;
    fin>>n;
    for(int i=1;i<=n;i++)
        for(int j=1;j<=n;j++)
            if(euclid(i,j)==1)
                cnt++;
    fout<<cnt;

    return 0;
}