#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");

long n,c=0;
int cmmdc (long a,long b)
{
int r;
    while (b)
    {
        r=a%b;
        a=b;
        b=r;
    }
return a;
}
void cautare(int x){
for(int i=1;i<=n;i++)
    for(int j=2;j<=n;j++)
    {
        if(cmmdc(i,j)==1)
        {
            c++;
        }


    }

}
int main()
{f>>n;
cautare(n);
g<<c+n;
    return 0;
}