#include<fstream.h>
int valid(unsigned long a, unsigned long b){
    
    int c;
    while (b) {
        c = a % b;
        a = b;
        b = c;
    }
    if(a!=1) return 0; else return 1;
}
int main(){
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    
    unsigned long n,i,j,k;
    
    f>>n;
    k=2*n-1;
    if(k>2)
    for(i=2;i<=n;i++)
      for(j=2;j<=n;j++)
       if((!(i%j==0)||(j%i==0)))
        if(valid(i,j))
          k++;
    
    g<<k;
    f.close();
    g.close();
    return 0;
}