#include<cstdio>
using namespace std;
int daca(int a,int b)
{
    int c,aux;
    if(a<b)
    {
        aux=a;
        a=b;
        b=aux;
    }
    while (b) {
        c = a % b;
        a = b;
        b = c;
    }
    return a;
}
int main()
{
    freopen("fractii.in","r",stdin);
    freopen("fractii.out","w",stdout);
    long long nr=0;
    int n,i,j;
    scanf("%d",&n);
    nr=n+n-1;
    for(i=2;i<=n;i++)
    {
        for(j=2;j<=n;j++)
        {
            if(daca(i,j)==1) nr++;
        }
    }
    printf("%I64d",nr);
    return 0;
}