#include<stdio.h>
int n,x=0,i,j;
int gcd(int a, int b)
{
    if (!b) return a;
    return gcd(b, a % b);
}
int main()
{   freopen("fractii.in","r",stdin);
    freopen("fractii.out","w",stdout);
    scanf("%d",&n);
    for(i=2;i<=n;i++)
    {
    for(j=1;j<=n;j++)
    if(gcd(i,j)==1)
    ++x;
    }
    x=x+n;
    printf("%d",x);
    return 0;
}