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