#include <bits/stdc++.h>
using namespace std;
#define int long long
#define endl '\n'
void solve() {
    int n; cin >> n;
    int a[n+1][n+1];
    int num = 1;
    for(int i = 1; i <= 2 * n - 1; i++){
        if(i&1){ 
            int row = (i <= n ? i : n);
            int col = (i <= n ? 1 : i - n + 1);
            while(row >= 1 && col <= n){
                a[row][col] = num++;
                row--;
                col++;
            }
        }else{
            int row = (i <= n ? 1 : i - n + 1);
            int col = (i <= n ? i : n);
            while(row <= n && col >= 1){
                a[row][col] = num++;
                row++;
                col--;
            }
        }
    }
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= n; j++){
            cout << a[i][j] << " ";
        }
        cout << '\n';
    }
}
signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0),cout.tie(0);
    int T = 1;
    // cin >> T;
    while (T--)
        solve();
    return 0;
}