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#include <iostream>
using namespace std;

int main() 
{
	int k;
	int i,x;
	int wynik[101];
	for (i=0; i<=100; i++) wynik[i]=-1;
	
	int ost=99;
	cin >> k;
	
	cout << ost << endl;
	i=1;
	while (k>1)
	{
		if (k%2) 
		{
			wynik[i]=ost-1;
			k-=1;
		} else
		{
			wynik[i]=i+2;
			k/=2;
		}
		i+=2;
	}
	for (i=1; i<ost; i++)
	{
		cout << i+1 << " " << wynik[i] << endl;
	}
	cout << -1 << " " << -1 << endl;

	return 0;
}