/*infoarena fractii*/

#include<fstream.h>


ifstream fin("fractii.in");
ofstream fout("fractii.out");

unsigned long n,total=63,i,j;

int main()
{
	cin>>n;
	for(i=11;i<=n;i++)
	{
		total+=2;
		for(j=2;j<=i;j++)
			if(n%j!=0) total+=2;
	}
	cout<<total;
	fout.close();
	return 0;
}