#include<iostream.h>      
#include<fstream.h>      
int main ()      
{      
int p,q,n,c=0;      
ifstream a("fractii.in");      
a>>n;      
a.close();      
for(p=1;p<=n;p++)      
{      
for(q=1;q<=n;q++)      
{      
if(p%q!=0)      
{      
c++;      
}      
}      
}      
ofstream  v("fractii.out");      
v<<c;      
v.close();      
return 0;      
}