#include <cstdio>

using namespace std;
int cmmdc(int a, int b)
{
    int aj;
    while(b!=0)
    {
        aj=a%b;
        a=b;
        b=aj;
    }
    return a;
}
int main()
{
    freopen("fractii.in","r",stdin);
    freopen("fractii.out","w",stdout);
    int i, j, n, cnt=0;
    scanf("%d", &n);
    for(i=1 ; i<=n ; i++)
        for(j=1 ; j<=n ; j++)
            if(cmmdc(i,j)==1)
                cnt++;
    printf("%d", cnt);
    return 0;
}