#include<fstream>
using namespace std;
ifstream in("fractii.in");
ofstream out("fractii.out");
int cmmdc(int a,int b);
int main()
{
    int n,total=0,i,j,k;
    in>>n;
    int nrdiv=0;
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=n;j++)
        {
            if(i<j){for(k=1;k<=i;k++)
            if(i%k==0&&j%k==0) nrdiv++;}
            else {for(k=1;k<=j;k++)
            if(i%k==0&&j%k==0) nrdiv++;}
            if(nrdiv== 1) total++;
        }
    }
    out<<total;
    in.close();
    out.close();
    return 0;
}