#include <iostream>
#include <fstream>
using namespace std;
 int n,i,numar,j;
 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");
cin>>n;
for(i=1;i<=n;i++)
    numar+=2;;
    for(i=2;i<=n;i++)
        for(j=1;j<=n;j++)
    {
        if(i%j!=0&&cmmdc(i,j)==1)
            {numar++;

    }
    }
    cout<<numar-1;
}