#include <fstream>

using namespace std;

int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    int n,i,j,s,r, x,y;

    s=1;
    f>>n;
    for(i=1;i<=n;i++)
    {
        x=i;
        for(j=1;j<=n;j++)
        {
            y=j;
            while(x%y)
            {
                r=x%y;
                x=y;
                y=r;

            }
            if (y==1)
            {
                s=s+1;
            }
        }
    }
    g<<s;
    f.close();
    g.close();
    return 0;
}