#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
//const long nPrime = 1000000007;
//const long nPrime = 998244353;
typedef long long ll;
int main() {
    long n;
    cin >> n;
    vector<vector<long>> vviAns(n,vector<long>(2*n-1,-1));
    for(long i = 0; i < 2*n-1; i++){
        vviAns[0][i] = 2*n-1;
    }
    long iTmp = 0;
    for(long i = 1; i <= n-1; i++){
        for(long j = 0; j < i; j++){
            long k = (iTmp+j)%(2*n-1);
            vviAns[i][k] = i;
        }
        for(long j = i; j < 2*n-1; j++){
            long k = (iTmp+j)%(2*n-1);
            vviAns[i][k] = 2*n-1-i;
        }
        if(i <= 7){
            iTmp += (i+2)/2;
        } else {
            iTmp += 2;
        }
        iTmp %= (2*n-1);
    } 
  
    cout << 2*n-1 << endl;
    for(long i = 0; i < 2*n-1; i++){
        for(long j = 0; j < n; j++){
            cout << vviAns[j][i] << " ";
        }
        cout << endl;
    }
    return 0;
}