#include <fstream>
#include <cmath>
using namespace std;

int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    int n,i,j,s,k;
    f>>n;
    s=n;
    for(i=2;i<=n;i++)
    for(j=1;j<=n;j++)
    {k=0;
        for(int d=2;d<=min(i,j);d++)
        {if(i%d==0 && j%d==0)    break;
        k++;}
    if(k==min(i,j)-1) s++;
    }
    g<<s;
    f.close();
    g.close();
    return 0;
}