#include <iostream>

using namespace std;
int euclid(int a, int b)
{
    int c;
    while (b) {
        c = a % b;
        a = b;
        b = c;
    }
    return a;
}
int main()
{
    ifstream cin("fractii.in");
    ofstream cout("fractii.out");
    int n,cnt=0;
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=n;j++)
        {
            if(euclid(i,j)==1)
                cnt++;
        }
    }
    cout<<cnt;
    return 0;
}