#include <iostream>
#include<fstream>

using namespace std;
int n,i,j,c=1,x,y;
int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    f>>n;

    for(i=1; i<=n; i++)
        for(j=1; j<=n; j++)
            {
                x=i;
                y=j;
                while(x!=y)
                {
                    if(x>y)
                        x=x-y;
                    else y=y-x;
                }
                if(y==1)
                    c++;
            }
    g<<c-1;
    return 0;
}