#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<ll,ll>;
#define rep(i, n) for(ll i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()
template<class T>bool chmin(T&a, const T&b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool chmax(T&a, const T&b){if(a<b){a=b;return 1;}return 0;}

int main(){
    ll n;
    cin >> n;
    cout << 2*n-1 << endl;
    rep(i,n){
        rep(j,n) cout << n+j << " ";
        cout << endl;
    }
    rep(i,n-1){
        rep(j,n){
            int x = i+j+1;
            if(x>=n) x += n-1-i;
            cout << x << " ";
        }
        cout << endl;
    }
    return 0;
}