#include <fstream>
using namespace std;
ifstream in("fractii.in");
ofstream out("fractii.out");
int main()
{
    int n,v=1,b,nr;
    in>>n;
    float a[2*n+1],i,j;
    a[1]=0;
    for (i=1;i<=n;i++)
    {
        for(j=1;j<=n;j++)
        {
            nr=0;
            for(b=1;b<=v;b++)
                if(a[b]==i/j)
                    nr=1;
            if(nr==0)
            {
                a[v]=i/j;
                v++;
            }
        }
    }
    out<<v-1;
}