#include <fstream>
using namespace std;
int main()
{
    int i,j,n,d=0,x,y;
    ifstream cin("fractii.in");
    ofstream cout("fractii.out");
    cin>>n;
    for(i=1; i<=n; i++)
    {
        for(j=1; j<=n; j++)
        {
            x=j;
            y=i;
            while(x!=y)
            {
                if(x>y)
                    x=x-y;
                if(y>x)
                    y=y-x;
            }
            if(y==1)
                d=d+1;
        }
    }
    cout<<d;
}