#include<iostream>
using namespace std;
int n,m;

int cmmdc(int a, int b)
{if((!a) || (!b)) return a+b;
if(a>b) return cmmdc(a%b,b);
return cmmdc(a,b%a);}

int main()
{cin>>n;
for(int i=1;i<=n;i++)for(int j=1;j<=n;j++)if(cmmdc(i,j)==1)m++;
cout<<m;
return 0;}