#include <stdio.h>

using namespace std;

int cmmdc(int a, int b)
{
    while (b > 0) {
        int r = a % b;
        a = b;
        b = r;
    }
    return a;
}

int main()
{
    FILE *file_in = fopen("fractii.in", "r");
    FILE *file_out = fopen("fractii.out", "w");
    int n, s = 0;
    fscanf(file_in, "%d", &n);
    s = 2 * n - 1;
    for (int i = 2; i <= n; i++) {
        for (int j = 2; j <= n; j++) {
            if (cmmdc(i, j) == 1) {
                s++;
            }
        }
    }
    fprintf(file_out, "%d\n", s);
}