//Bou Marian Catalin
#include<fstream.h>
ifstream fin("fractii.in");
ofstream fout("fractii.out");
long cmmdc(int a,int b)
{int r;
while(b){r=a%b;a=b;b=r;}
return a;}
int main()
{long n,i,j,max=0;
fin>>n;
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
if(cmmdc(i,j)==1)max++;
fout<<max;
}