#include <iostream>
#include <vector>
using namespace std;
int main()
{
    int N;
    cin >> N;
    vector<int> ans;
    int M = 2 * N - 1;
    for (int i = 0; i < M; i++) {
        ans.push_back(M);
    }
    int now = 0;
    vector<bool> did(2 * N - 1, false), usd(2 * N, false);
    did[0] = true;
    usd[M] = true;
    int cnt = 0;
    for (int i = 1; i < M; i++) {
        int fl = 1;
        while (fl < M && (did[(now + fl) % M] || usd[fl]))
            fl++;
        if (fl == M) {
            /*if (cnt) {
                return 0;
            }*/
            fl = 1;
            while (usd[fl]) {
                fl++;
            }
            cnt++;
        }
        //cout << fl << endl;
        for (int j = 0; j < fl; j++) {
            ans.push_back(fl);
        }
        did[(now + fl) % M] = true;
        usd[fl] = true;
        now = (now + fl) % M;
    }
    cout << 2 * N - 1 << endl;
    for (int i = 0; i < 2 * N - 1; i++) {
        for (int j = 0; j < N; j++) {
            cout << ans[i + j * (2 * N - 1)] << (j < N - 1 ? " " : "");
        }
        cout << endl;
    }
}