#include<stdio.h>
using namespace std;
int main()
{
    int p,q,n,nr,i,j,x,y,c;
    freopen("fractii.in","r",stdin);
    freopen("fractii.out","w",stdout);
    scanf("%d",&n);
    nr=2*n-1;
    for(p=2;p<=n;p++)
    {
        for(q=2;q<=n;q++)
        {
            if(p!=q)
            {
                x=p;y=q;
                while(y!=0)
                {c=x%y;
                x=y;
                y=c;}
                if(x==1)
                nr++;
            }
        }
    }
    printf("%d",nr);
    return 0;
}