#include <iostream>
#include <fstream>

using namespace std;

int n, coun, i, j;
int cmmdc(int a, int b)
{
int r;
r=a%b;
while(r!=0)
{
a=b;
b=r;
r=a%b;
}
return b;
}

int main()
{
    ifstream in("fractii.in");
    ofstream out("fractii.out");
    in>>n;
    for(i=1;i<=n;i++){
        for(j=1;j<=n;j++){
            if(cmmdc(i,j)==1){
                coun++;
                }
            }
        }
        out<<coun;
    in.close();
    out.close();
    return 0;
}