#include<bits/stdc++.h> using namespace std; int num[109][109],n; int main(){ num[1][1]=1; cin>>n; for(int i=1,j=1,tot=1;tot<n*n;){ while(++j<=n&&num[i][j]==0)num[i][j]=++tot;--j; while(++i<=n&&num[i][j]==0)num[i][j]=++tot;--i; while(--j> 0&&num[i][j]==0)num[i][j]=++tot;++j; while(--i> 0&&num[i][j]==0)num[i][j]=++tot;++i; } for(int i=1;i<=n;++i,cout<<endl)for(int j=1;j<=n;++j)cout<<num[i][j]<<" "; return 0; }