#include <stdio.h>

int cmmdc(int a, int b)
{
    int t;
    while(b!=0)
    {
        t=b;
        b=a%b;
        a=t;
    }
    return a;
}
int main()
{
    //freopen("fractii.in","r",stdin);
    //freopen("fractii.out","w",stdout);
    int n,s;
    scanf("%d",&n);
    s=n;
    for (int i=1; i<=n; i++)
        for (int j=2; j<=n; j++)
            if(cmmdc(i,j)==1)
                s++;
    printf("%d",s);
    fflush(stdout);
}