include<fstream>
using namespace std;
int main()
{
ifstream f("fractii.in");
ofstream g("fractii.out");
float v[100],a[100][100],copie;
int i,j,k,ok,n,s=0;

f>>n;

for(i=1;i<=n;i++)
                  for(j=1;j<=n;j++)
	     { a[i][j]=i/j; 
	       v[k++]=a[i][j]; 
                   }

do{
	ok=1;
	for(i=1;i<=n*n-1;i=i+1)
		if(v[i]>v[i+1]) {ok=0; copie=v[i]; v[i]=v[i+1]; v[i+1]=copie;}
}while(!ok);

for(i=1;i<=n*n-1;i++) 
	if(v[i]!=v[i+1]) s++;
g<<s;
}