#include <iostream>
#include <fstream>

using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");

int n,i,j,a,b;
unsigned long long t=0;
int main()
{fin>>n;
for(i=1;i<=n;i++)
{
    for(j=1;j<=n;j++)
    {a=i;b=j;
        while(a!=b)if(a>b) a=a-b;else b=b-a;
        if(b==1)t++;
//if(b==1)cout<<i<<"/"<<j<<" ";

    }//cout<<t<<endl;
}fout<<t;
fin.close();fout.close();
    return 0;
}