#include<fstream>
#include<iostream>
#include<math.h>
#include<stdio.h>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");

int n,i,j,nr,ok,k;
float a[1000],x;

int main()
{ f>>n;
nr=0;
 
 for(i=1;i<=n;i++)
   for(j=1;j<=n;j++)
   {ok=0; x=(float)i/j;
    for(k=1;k<=nr;k++)
        if(a[k]==x)
        ok=1; 
        
      if(ok==0)
      {nr++;
      a[nr]=(float)i/j;
    }
}


g<<nr;


return 0;
}