#include <fstream.h>
int main ()
{long long i,n,j,y,x,nr=0;
ifstream q ("fractii.in");
ofstream w ("fractii.out");
q>>n;
for(i=2;i<=n;i++)
	for(j=1;j<=n;j++)
		{x=i;
		y=j;
		while(x!=y)
			if(x>y)
				x=x-y;
			else
				y=y-x;
		if(x==1)
			nr++;
		}
nr=nr+n;
w<<nr<<'\n';
return 0;
}