#include<iostream>
#include<fstream>
using namespace std;
int main()
{ long int n,i,j,s,r;
ifstream f("fractii.int");
ofstream g("fractii.out");
f>>n;
s=2*n;

for(i=2;i<=n;i++)
for(j=2;j<=n;j++)
{long int x,y;
x=i;y=j;
while(x%y!=0)
{r=x%y;
x=y;
y=r;
}
if(y==1)
s++;
}
g<<s-1;
f.close();
g.close();

}