#include<fstream.h>
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int n,i,j,s=0;
int divi(int x,int y)
{
	while(x!=y)
		if(x>y)
			x=x-y;
		else
			y=y-x;
	if(x==1)
		s++;
	return 0;
}
int per(int i,int j)
{
	if(i==n&&j==n)
		return 0;
	divi(i,j);
	if(j<n)
		per(i,j+1);
	else
		per(i+1,1);
	return 0;
}
int main()
{
	fin>>n;
	per(1,1);
	fout<<s;
	fin.close();
	fout.close();
}