#include<bits/stdc++.h> using namespace std; int main(){ int n,num=1; cin>>n; int a[n+1][n+1]; int x=1,y=n; a[x][y]=num; while(num<n*n){ if(y-1>0){ a[x][--y]=++num; } else{ a[++x][y]=++num; } } while(x+1<=n&&y+1<=n){ a[++x][++y]=++num; if(x+1<=n){ a[++x][y]=++num; } else{ a[x][--y]=++num; } } while(x-1>=0&&y-1>0){ a[--x][--y]=++num; } for(int i=1;i<=n;i++){ for(int j=1;j<=n;j++){ cout<<setw(5)<<a[i][j]; } cout<<endl; } return 0; }