#include<stdio.h>
int n,i,j,count;
int ireductibile(int i,int j)
{
	int k,min;
	min=j;
	if(i<j)
		min=i;
	for(k=2;k<=min;k++)
		if((i%k==0)&&(j%k==0))
			return 0;
	return 1;
}
int main(){
	FILE *fin;
	fin=fopen("fractii.in","rt");
	fscanf(fin,"%d",&n);
	for(i=2;i<=n;i++)
		for(j=1;j<=n;j++)
			if(ireductibile(i,j))
				count++;
	FILE *fout;
	fout=fopen("fractii.out","wt");
	fprintf(fout,"%d",count+n);
	return 0;
}