#include<bits/stdc++.h> using namespace std; int a[50][50]; int main() { int n,x,y,s; x=1; y=1; a[x][y]=s=1; cin>>n; while(s<n*n) { while(y+1<=n&&a[x][y+1]==0) a[x][++y]=++s; while(x+1<=n&&a[x+1][y]==0) a[++x][y]=++s; while(y-1>=1&&a[x][y-1]==0) a[x][--y]=++s; while(x-1>=1&&a[x-1][y]==0) a[--x][y]=++s; } for(int i=1;i<=n;i++){ for(int j=1;j<=n;j++){ cout<<setw(4)<<a[i][j]; } cout<<endl; } return 0; }