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#include <bits/stdc++.h>

using namespace std;
const int D = 100;
int kraw[107][2];

void Graf()
{
	int k, v, i;
	cin >> k;
	v = 1;
	for(i = 1; i <= D; ++i)
	{
		kraw[i][0] = -1;
		kraw[i][1] = -1;
	}
	if(k % 2 == 1)
	{
		kraw[v][1] = D;
		kraw[v][0] = v + 1;
		++v;
	}
	k /= 2;
	while(k > 0)
	{
		//cout << k << "\n";
		kraw[v][0] = v + 1;
		kraw[v][1] = v + 2;
		kraw[v + 1][0] = v + 3;
		kraw[v + 2][0] = v + 3;
		if(k % 2 == 1)
		{
			 kraw[v + 1][1] = D;
			 kraw[v + 2][1] = D;
		}
		v += 3;
		k /= 2;
	}
	cout << D << "\n";
	for(i = 1; i <= D; ++i)
	{
		cout << kraw[i][0] << " " << kraw[i][1] << "\n";
	}
}

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	Graf();
	
	return 0;
}