#include <iostream>
#include <fstream>
#define nmax 10000
using namespace std;

bool verificare(float x , float v[] ,int nr){
    if(nr==0) return 1;
    else{
        bool k = 1;
        for(int i=1;i<=nr;i++)
            if(v[i]==x) k = 0;
        return k;
    }
}

int main()
{
    int n  , nr = 0;
    float v[nmax];
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    f >> n;
    for(int i = 1;i<=n;i++)
        for(int j=1;j<=n;j++)
    if(verificare((float)i/j,v,nr) == 1){
        nr++;
        v[nr] = (float)i/j;
    }
    cout << nr;
    return 0;
}