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