#include<fstream.h>
int prim(int a,int b)
{if(a>b)
 if(a%b!=0)return 1;
 else return 0;
else 
 if(b%a!=0)return 1;
 else return 0;
}
int main()
{
int n,nr=0;
ifstream f("fractii.in");
ofstream g("fractii.out");
f>>n;
for(int i=1;i<=n;i++)
for(int j=1;j<=n;j++)
if(!prim(i,j))nr++;
g<<nr-1;
f.close();
g.close();
return 0;
}