#include <fstream>

using namespace std;
ifstream in("fractii.in");
ofstream out("fractii.out");
int cmmdc(int a,int b)
{
    int r;
    while(b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    int n,i,j,f=0;
    in>>n;
    f=n;
    for(i=2;i<=n;i++)
        for(j=1;j<=n;j++)
            if(cmmdc(i,j)==1)
                f++;
    out<<f;
    return 0;
}