#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int N,a,b,c,d,nd;
int main()
{
    f>>N;
    a=1;
    b=1;
    c=0;
    while(a<=N)
    {
        d=2;
        nd=0;
        for(d=2;d<=a;d++)
        if(a%d==0 && b%d==0)
        nd++;
        if(nd==0)
            c++;
        b++;
        if(b>N)
        {
        b=1;
        a++;
        }
    }
    g<<c;
    return 0;
}