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