#include <iostream>
#include <set>
#include <fstream>

int main(){
    std::ifstream fin("fractii.in");
    std::ofstream fout("fractii.out");
    int n = 0;
    float sum = 0;
    fin>>n;
    std::set<float> s;
    for(int i =1;i<=n;++i){
        for(int j = 1; j<=n;++j){
            sum = (float)i / j;
            s.insert(sum);
        }
    }
    fout<<s.size();
    return 0;
}