#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int x;
int cmmdc(int x, int y){
    while(x!=y){
        if(x>y) x-=y;
        if(x<y) y-=x;
    }
    return x;
}
int main()
{
    f>>x;
    int k=0;
    for(int i=1; i<=x; i++)
        for(int j=1; j<=x; j++)
            if(cmmdc(i,j)==1) k++;
            g<<k;
    return 0;
}