#include<iostream.h>
#include<fstream.h>
ifstream(f);
ofstream(g);
int cmmdc(int a,int b)
{while(0==0)
{
int r=a%b;
if (r==0) break;
a=b;
b=r;
}
return b;
}
int main()
{
f.open("fractii.in");
g.open("fractii.out");
long int n;
long long int s=0;
f>>n;
for(int i=1;i<=n;i++)
{for(int j=1;j<=n;j++)
{if(cmmdc(i,j)==1) s++;}
}
g<<s;
f.close();
g.close();
return 0;
}