#include <cstdio>

using namespace std;

int main()
{
    freopen("fractii.in", "r", stdin);
    int n, i, j, k;
    scanf("%d", &n);
    fclose(stdin);
    k=n*n;
    for(i=1; i<=n; i++)
        for(j=1; j<=n; j++) if(i!=1 && j!=1) if(j==i)k--;
                                            else if(j>i) {if(j%i==0)k--;}
                                                else if(i%j==0)k--;
    freopen("fractii.out", "w", stdout);
    printf("%d", k);
    fclose(stdout);
    return 0;
}