#include <fstream>

using namespace std;

float i[1000000], j[1000000]; int n, non, z;

void gen ()
{
    int s=1, g=1;
    while (s<=non) for (int l=1; l<=n; ++l) j[s++]=l;
    for (s=1; s<non; s+=n) {
        for (int l=s; l<s+n; ++l) i[l]=g; ++g;
    }
}
void procesare ()
{
    for (int l=1; l<=non; ++l) if (i[l])
    for (int q=l+n; q<=non; ++q) if (i[q]/i[l] == j[q]/j[l]) {
        i[q]=0; j[q]=0;
    }
    for (int miu=1; miu<=non; ++miu) if (i[miu] == 0) --z;
}
int main()
{
    ifstream in ("fractii.in");
    ofstream out ("fractii.out");
    in>>n;
    non=n*n; z=non;
    gen();
    procesare();
    out<<z;
    return 0;
}