#include<fstream>
#include<iostream>
using namespace std;
int cmmdc(int a,int b)
{while(a!=b)
{if(a>b)
        a=a-b;
else
        b=b-a;
}
if(a!=1)
        return a;
else
        return 0;
}
int main()
{
    long int n;
    int k=0;
    fstream f("fractii.in",ios::in);
    fstream g("fractii.out",ios::out);
    f>>n;
    for(int i=1;i<n;i+2)
            for(int j=1;j<n;j+2)
                    if(cmmdc(i,j)==0)
                                     k++;
    g<<k;
    f.close();
    g.close();
    return 0;

}