#include<iostream>
#include<fstream>
using namespace std;
ifstream fi("fractii.in");
ofstream fo("fractii.out");

int main () {

int n,i,k;
double p,q;
fi>>n;
double a[n*n]={0};
k=0;

for(p=1;p<=n;p++){
	for(q=1;q<=n;q++){
	    for(i=1;i<=n*n;i++){
			if((a[i]==p/q)) {
				break;
				} else if (a[i]==0){
				            a[i]=p/q;
				            k++;
				            break;			
				}
			}
		}
	}
fo<<k;
return 0;
}