#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define rep(i,n) for(int i=0;i<n;i++)
#define riano_ std::ios::sync_with_stdio(false);std::cin.tie(nullptr)

int main() {
    riano_; ll ans = 0;
    ll N; cin >> N;
    cout << 2*N-1 << endl;
    vector<vector<ll>> a(2*N-1,vector<ll>(N));
    rep(i,N){
        int s = 2*i+1;
        rep(j,s) a[j][i] = s;
        int k = 2*N-1-s;
        rep(j,k) a[j+s][i] = k;
    }
    rep(i,2*N-1){
        rep(j,N){
            cout << a[i][j] << " ";
        }
        cout << endl;
    }
    //cout << ans << endl;
}