#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int main()
{
    int n,i,j,a,b,r,s=1;
    fin>>n;
    for(i=1; i<=n; i++)
        for(j=1; j<=n; j++)
        {
            if(i!=j)
            {
                a=i;
                b=j;
                while(b)
                {
                    r=a%b;
                    a=b;
                    b=r;
                }
                if(a==1) s++;
            }

        }
    fout<<s;
    return 0;
}