#include <fstream>
using namespace std;
ifstream cin ("fractii.in");
ofstream cout ("fractii.out");
int n,fr;
int cmmdc (int a,int b)
{
    if(b==0) return a;
    else return cmmdc(b,a%b);
}
int main()
{
    cin>>n;
    fr+=n; // ptr 1
    for(int i=2;i<=n;i++)
    {
        for(int j=1;j<=n;j++)
            if(cmmdc(i,j)==1) fr++;
    }
    cout<<fr;
}