#include <iostream>
#include <fstream>
using namespace std;
int x; int y;

int cmmdc(int a, int b){
    x=a; y=b;
    while(x!=y){if(x>y)x=x-y; if(x<y)y=y-x;}
    return x;
}

int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    int N,k=0;
    f>>N;
    for(int i=1; i<=N;i++)
    {
        for(int j=1; j<=N; j++)
        {
            if(cmmdc(i,j)==1)k++;
        }
    }
    g<<k;
    f.close();
    g.close();
    return 0;
}