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

bool apartine(float *v, float n, int k) {
    for (int i = 0; i < k; ++i) {
        if (v[i] == n) {
            return true;
        }
    }
    return false;
}

int fractii(int n) {
    float v[101];
    int k = 0;
    for (float i = 1; i <= n; ++i) {
        for (float j = 1; j <= n; ++j) {
            if(!apartine(v, float(i/j), k)) {
                v[k] = i/j;
                k++;
            }
        }
    }
    return k;
}

int main() {
    ifstream fin;
    ofstream fout;
    fin.open("fractii.in");
    fout.open("fractii.out");

    int n;
    fin >> n;
    fout << fractii(n);

    fin.close();
    fout.close();
    return 0;
}