#include<bits/stdc++.h> using namespace std; int a[101][101]; int main(){ int n,sum=1; cin>>n; int i=1,j=n; a[i][j]=sum; while(sum<n*n){ while(i+1<=n&&a[i+1][j]==0) a[++i][j]=++sum; while(j-1>=1&&a[i][j-1]==0) a[i][--j]=++sum; while(i-1>=1&&a[i-1][j]==0) a[--i][j]=++sum; while(j+1<=n&&a[i][j+1]==0) a[i][++j]=++sum; } for(int i=1;i<=n;i++){ for(int j=1;j<=n;j++){ cout<<a[i][j]<<" "; } cout<<endl; } return 0; }