#include <fstream>

using namespace std;

ifstream in("fractii.in");
ofstream out("fractii.out");
int cmmdc(int a, int b)
{
    while(a!=b)
    if(a>b) a-=b;
    else b-=a;
    return a;
}
int main()
{
    int n,i,j,k=0;
    in>>n;
    for(i=1;i<=n;i++)
        for(j=1;j<=n;j++)
            if(cmmdc(i,j)==1) k++;
    out<<k;
    in.close();
    out.close();

    return 0;
}