#include <fstream>

using namespace std;

int main()
{
    ifstream fin("fractii.in");
    ofstream fout("fractii.out");
    int n,cnt=0,a,b=1,r;
    fin >> n;
    for(int i=1;i<=n;i++)
    {
        a=i;
        b=1;
        for(int j=1;j<=a;j++)
        {
            b=j;
        r=a%b;
        while(r!=0)
        {
            a=b;
            b=r;
            r=a%b;
        }
        if(b==1)
            cnt++;
        }
    }
    fout << cnt;
    return 0;
}