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