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#include<iostream>
using namespace std;

const int BRAK = -1, N = 94;

int T[N+1][2];

int main () {
	ios_base::sync_with_stdio(0);
	unsigned int k, j = 1;
	cin>>k;
	for (int i = 1; i < 16; ++i) {
		T[i][0] = i*2;
		T[i][1] = i*2+1;
	}
	int a, x = N;
	for (int i = 16; i < 32; ++i) {
		for (int l = 0; l < 2; ++l) {
			if (k & j) T[i][l] = x;
			else T[i][l] = BRAK;
			x -= 2;
			j <<= 1;
		}
	}
	for (int i = 32; i < N; i += 2) {
		T[i][0] = i+1;
		T[i][1] = i+2;
		T[i+1][0] = i+2;
		T[i+1][1] = BRAK;
	}
	T[N][0] = T[N][1] = BRAK;
	cout<<N<<'\n';
	for (int i = 1; i <= N; ++i) cout<<T[i][0]<<' '<<T[i][1]<<'\n';
	return 0;
}