#include <fstream>
using namespace std;
int main(){
	int N, fin = 0, i, j;
	ifstream input("fractii.in");
	ofstream output("fractii.out"),debug("debug.txt");
	input>>N;
	for(i=1;i<=N;i++){
		for(j=1;j<=N;j++){
			if(j==1||i==1){fin++;debug<<i<<"/"<<j<<endl;}
			if(i%j!=0&&j%i!=0){fin++;debug<<i<<"/"<<j<<endl;}
		}
	}
	output<<fin;
	return 0;}