#include <fstream>
using namespace std;
ifstream cin("fractii.in");
ofstream cout("fractii.out");
int n;
int nr;
int cmmdc(int a, int b)
{
    int r=0;
    while(b !=0){
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    cin>>n;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            if(cmmdc(i,j) == 1){
                nr++;
            }
        }
    }
    cout<<nr;
    
    return 0;
}