/*
Phạm Hoàng Tiến - 20230071
Em có sử dụng Mersenne Twister vì hàm rand() bình thường sẽ ra 1 chuỗi số cố định, nên không phù hợp
Article:
https://c...content-available-to-author-only...s.com/reference/random/mt19937/
*/
 
#include <bits/stdc++.h>
 
using namespace std;
 
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
 
int n;
 
int abs (int x)
{
    if (x < 0) return -x;
    return x;
}
 
//trả về số ngẫu nhiên trong khoảng từ l đến r
int rng(int l, int r)
{
    return l + abs((int)(rnd())) % (r - l + 1);
}
 
int main()
{
    //freopen("ktlt.txt", "w", stdout);
 
    cin >> n;
    cout << n << "\n";
 
    int pre = 100;
    int x, y, m, cur;
    while (n--)
    {
        m = rng(1, 10);
 
        cur = rng(1, 100);
        cout << cur << "\n";
 
        vector<int> vx, vy;
 
        vx.push_back(rng(1, 100));
        vy.push_back(rng(1, pre - 1));
 
        for (int i = 2; i <= m; i++)
        {
            vx.push_back(rng(1, 100));
            vy.push_back(rng(1, 100));
        }
 
        sort(vy.begin(), vy.end());
 
        if (vy[m - 1] == 1) vy[m - 1]++;
        pre = vy[m - 1];
 
        for (int i = 0; i < m; i++) cout << vx[i] << " " << vy[i] << "\n";
 
    }
}

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