#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    int n;
    f >> n;
    long int db = 2*n-1;

    for(int i = 2;i<=n;i++) {
        for(int j = 2;j<=n;j++) {
            int ii = i;
            int jj = j;
            while(ii!=jj) {
                if(ii<jj) {jj = jj - ii;}
                else {ii = ii - jj;}
            }
            if(ii==1) {db++;}
        }
    }
    g << db;
    return 0;
}