#include<stdio.h>
using namespace std;
int cmmdc(int a, int b)
{
    if((!a) || (!b)) return a+b;
    if(a>b) return cmmdc(a%b,b);
    return cmmdc(a,b%a);
}
int main()
{
    unsigned m=0;
    freopen("fractii.in","r",stdin);
    freopen("fractii.out","w",stdout);
    unsigned n;
    scanf("%u",&n);
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=n;j++)
        {
            m++;
            if(cmmdc(i,j)!=1)
            {
                m--;
            }
        }
    }
    printf("%u",m);
    return 0;
}