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#include <bits/stdc++.h>
using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int n,rez;
int cmmdc(int a,int b)
{
    int r=a%b;
    while(r)
    {
        a=b;
        b=r;
        r=a%b;
    }
    return b;
}
int main()
{
    fin>>n;
    rez=n;
    for(int i=2; i<=n; i++)
    {
      for(int j=1; j<=n; j++) if(cmmdc(i,j)==1) rez++;
    }
  fout<<rez;
    return 0;
}