#include <iostream>
#include <fstream>
using namespace std;
int cmmdc(int a,int b)
{
    while(a!=b)
    {
        if(a>b) a=a-b;
        else b=b-a;
    }
    return a;
}
int main()
{
int N,i,j,nr=0;
freopen ("fractii.in" , "r+",stdin);
freopen ("fractii.out" , "w+",stdout);
scanf("%d",&N);
for(i=1;i<=N;i++)
    for(j=1;j<=N;j++)
    {
        if(cmmdc(i,j)==1)
        nr++;
    }
printf("%d", nr);
return 0;
}