#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int nr,a[1000001][1000001];
long long n=1000000;
int cmmdc(int a,int b)
{
    int r;
    while(b){
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
void constr_matr(int a[][],long long n)
{
    int i,j;
    for(i=1;i<=n;i++)
        for(j=1;j<=n;j++)
            a[i][j]=cmmdc(i,j);


}
int numar(int a[][],long long n)
{
    int i,j,nr=0;
    for(i=1;i<=n;i++)
        for(j=1;j<=n;j++)
            if(a[i][j]==1) nr++;
    return nr;
}

int main()
{ f>>n;
constr_matr(a,n);
g<<numar(a,n);



    return 0;
}