#include <iostream>
#include <fstream>
using namespace std;
long long n,i,j,k,nr,OK;
ifstream f("fractii.in");
ofstream g("fractii.out");
int main()
{f>>n;nr=1;
    for (i=1;i<=n;i++)
for (j=1;j<=n;j++)
{OK=0;
for(k=2;k<=n;k++)
if (i!=j)
if (i%k!=0 && j%k!=0 && OK==0){nr=nr+1;OK=1;}}
    g<<nr<<endl;;
f.close();
g.close();


    return 0;
}