#include <iostream>
#include <fstream>
using namespace std;
int cmmdc(int a,int b)
{
while(a!=b)
if(a>b) a=a-b;
else b=b-a;
return a;
}
int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    int fractii;
    int numar;
    while(f>>numar)
    {
        fractii=0;
        for(int i=1;i<=numar;i++)
            for(int j=1;j<=numar;j++)
                if(cmmdc(i,j)==1)
                    fractii++;
        g<<fractii<<endl;
    }
    f.close();g.close();

    return 0;
}