#include <bits/stdc++.h>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int euclid(int a,int b)
{
    int r;
    while(a%b!=0)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return b;
}
int main()
{
    int x,k;
        k=0;
        f>>x;
        for(int i=1;i<=x;i++)
            for(int j=1;j<=x;j++)
            if(euclid(i,j)==1)
            k++;
        g<<k<<'\n';
}