#include<stdio.h>
using namespace std;
int n,i,j,a,b,c,k;
int main()
{
    freopen("fractii.in","r",stdin);
    freopen("fractii.out","w",stdout);
    scanf("%d",&n);
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=n;j++)
        {
            a=i;
            b=j;
            while(b)
            {
                c=a%b;
                a=b;
                b=c;
            }
            if(a==1)k++;
        }
    }
    printf("%d\n",k);
    return 0;
}