#include <stdio.h>
using namespace std;
int i,j,nr,a,b,n;
int cmmdc(int ca, int cb)
{
    a=ca ; b=cb;
    int r=a%b;
    while(r!=0)
    {
        a=b; b=r; r=a%b;
    }
    return b;
}
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++)
        {
            if(cmmdc(i,j)==1)
            {
                nr++;
            }
        }
    }
    printf("%d",nr);

    return 0;
}