#include <iostream>
#include <fstream>
using namespace std;
int n,i,a,b,r,j,ok;
long long nrf;
ofstream g("fractii.out");
int main()
{freopen("fractii.in","r",stdin);
scanf("%d",&n);
nrf=2*n-1;
for(i=2;i<=n;i++)
    for(j=2;j<=n;j++)
    {
        ok=0;
        if(i!=j&&i%2==0&&j%2==0)
                ok=1;
        if(j!=i&&i%j!=0&&j%i!=0)
        {
            a=i;
            b=j;
            r=a%b;
            while(r)
            {
                a=b;
                b=r;
                r=a%b;
            }
            if(b==1)
                nrf++;
        }
    }
g<<nrf;

    return 0;
}