#include<bits/stdc++.h> using namespace std; int a[50][50]; int main() { int n; cin>>n; int x=1,y=1,s=1; a[1][1]=1; while(s<n*n){ while(x+1<=n&&a[x+1][y]==0) a[++x][y]=++s; y++; x++; while(x-1>=1&&a[x-1][y]==0) a[--x][y]=++s; y++; x--; } for(int i=1;i<=n;i++){ for(int j=1;j<=n;j++){ cout<<setw(3)<<a[i][j]<<" "; } cout<<endl; } return 0; }