#include<iostream>
using namespace std;

int n, i, j, k=0;
int cmmdc(int x,int y){
    if(x>y)
        return cmmdc(x-y,y);
    if(y>x)
        return cmmdc(x,y-x);
    if(x==y)
        return x;
}
int main(){
	cout<<"n=";cin >> n;
	for (i = 1; i <= n; i++)
        for (j = 1; j <= n; j++)
            if(cmmdc(i,j)==1)
                k++;

	cout << k;
	return 0;
}