#include <iostream>
#include <fstream>
using namespace std;

int nueste(float v[],float x,int n)
{
    for (int i=1;i<=n;i++)
        if (v[i]==x) return 0; return 1;
}

int main()
{   ifstream in("fractii.in");
ofstream out("fractii.out");
    long long n=0, N; in>>N;
    float v[100002];
    for(float i=1;i<=N;i++)
        for(float j=1;j<=N;j++)
        if(nueste(v,i/j,n))
    { v[n+1]=i/j; n++;}
    out<<n;
}