#include <iostream>
#include <fstream>
using namespace std;
int cmmdc(int a, int b){
    while(a!=b){
    if(a>b)
        a=a-b;
    if(b>a)
        b=b-a;
    }
    return a;
}
int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    int i,j,n,k=0;
    f>>n;
    for(i=1;i<=n;i++)
        for(j=1;j<=n;j++)
            if(cmmdc(i,j)==1)
                k++;
    g<<k;
    return 0;
}