#include <bits/stdc++.h>
using namespace std;
int main () {
    int N;
    cin >> N;
    int M = N * 2 - 1;
    cout << M << endl;
    vector<int> ans;
    for (int i = M; i >= N; i --) {
        int a = i;
        if ((M - i) % 2) {
            a = M - i;
        }
        for (int j = 0; j < a; j ++) {
            ans.push_back(a);
        }
        if (a < M) {
            for (int j = 0; j < M - a; j ++) {
                ans.push_back(M - a);
            }
        }
    }
    for (int i = 0; i < M; i ++) {
        for (int j = 0; j < N; j ++) {
            cout << ans[i + j * M] << (j < N - 1 ? " " : "");
        }
        cout << endl;
    }
}