1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
#include<iostream>

using namespace std;

const int MAX_K_BIT = 30;
const int n = MAX_K_BIT << 1;

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int k;
	cin >> k;
	cout << n << "\n";
	for(int i = 1; i < MAX_K_BIT; i++) {
		cout << i+1 << " " << i+MAX_K_BIT << "\n";
	}
	if(k & (1 << (MAX_K_BIT-1))) {
		cout << n << " -1\n";
	}
	else {
		cout << "-1 -1\n";
	}
	for(int i = 1; i < MAX_K_BIT; i++) {
		if(k & (1 << (i-1))) {
			cout << i+1 << " " << n << "\n";
		}
		else {
			cout << i+1 << " -1\n";
		}
	}
	cout << "-1 -1\n";
	return 0;
}