#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<bits/stdc++.h> #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int n,a[21][21]; int t=1; cin>>n; for(int k=1;k<=(n+1)/2;k++){ for(int j=k;j<=n-k+1;j++) a[k][j]=t++; for(int i=k+1;i<=n-k+1;i++) a[i][n-k+1]=t++; for(int j=n-k;j>=k;j--) a[n-k+1][j]=t++; for(int i=n-k;i>=k+1;i--) a[i][k]=t++; } for(int i=1;i<=n;i++){ for(int j=1;j<=n;j++){ cout<<setw(4)<<a[i][j]; if(j==n) cout<<endl; } } return 0; }