#include<cstdio>
using namespace std;

int main()
{
    FILE *f=fopen("fractii.in","r"),*g=fopen("fractii.out","w");
    int x,a,b,c=0;
    fscanf(f,"%i",&x);
    for(a=1;a<=x;a++)
    {
        for(b=1;b<=x;b++)
        {
            if(a%b!=0 || a==b)
            {
                c++;
            }
        }
    }
    fprintf(g,"%i",c);
    fclose(f);
    fclose(g);
    return 0;
}