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
35
36
37
38
39
40
41
42
43
#include <iostream>
#include <vector>
#include <algorithm>

int main() {
    int k;
    std::cin >> k;
    std::vector<int> bin;
    while (k != 0) {
        bin.push_back(k % 2);
        k /= 2;
    }
    while (bin.size() < 30) {
        bin.push_back(0);
    }
    std::reverse(bin.begin(), bin.end());
    std::cout << "89\n";
    for (int i = 1; i <= 30; i++) {
        if (i < 30) {
            if (bin[i - 1] == 1) {
                std::cout << i + 1 << " " << 30 + 2 * i - 1 << "\n";
            } else {
                std::cout << i + 1 << " " << -1 << "\n";
            }
        } else {
            if (bin[i - 1] == 1) {
                std::cout << -1 << " " << 30 + 2 * i - 1 << "\n";
            } else {
                std::cout << -1 << " " << -1 << "\n";
            }
        }
    }

    for (int i = 31; i < 89; i++) {
        if (i % 2 == 1) {
            std::cout << i + 1 << " " << i + 2 << "\n";
        } else {
            std::cout << i + 1 << " " << -1 << "\n";
        }
    }
    std::cout << "-1 -1";
    return 0;
}