#include<bits/stdc++.h>
using namespace std;

int main(){
    int n,cnt,f;
    cin >> n;
    vector<vector<int> > v(n,vector<int>(n,0));
    cnt=1;f=0;
    int dx=0,dy=0;
    while(cnt<=n*n){
        if(v[dy][dx]!=0) f++;
        else v[dy][dx]=cnt++;
        if(f%4==0&&dx+1<n&&v[dy][dx+1]==0) dx++;
        if(f%4==1&&dy+1<n&&v[dy+1][dx]==0) dy++;
        if(f%4==2&&dx-1>=0&&v[dy][dx-1]==0) dx--;
        if(f%4==3&&v[dy-1][dx]==0) dy--;
    }
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            printf("%03d ",v[i][j]);
        }
        cout << endl;
    }
    return 0;
}