#include<fstream.h>  
#include<math.h>  
int main()  
{long int n,i,j,nr=0,a,b,t,d;  
ifstream f("fractii.in");  
ofstream g("fractii.out");  
f>>n;  
nr=n+n-1;  
for(i=2;i<=n;i++)  
    for(j=2;j<=n;j++)  
    {a=i<=j?i:j;
	b=j>=i?j:i;
	 t=0;
	d=2;
	while(a%d==0 && t==0)  
            {a/=d;  
            if(b%d==0) t=1;}    
   for(d=3;d<=a && t==0; d+=2)  
        while(a%d==0 && t==0)  
            {a/=d;  
            if(b%d==0) t=1;}  
    if(t==0) nr++;  
     }  
  
g<<nr;  
f.close(); g.close();  
return 0; }