#include<stdio.h>
#include<memory.h>
#define MAX 20
int a[MAX][MAX];
int main(){
    int n,x,y,tot=0;
    scanf("%d",&n);
    memset(a,0,sizeof(a));
    tot=a[x=0][y=n-1]=1;
    while(tot<n*n){
        while(x+1<n && !a[x+1][y]) a[++x][y]=++tot;
        while(y-1>=0 && !a[x][y-1]) a[x][--y]=++tot;
        while(x-1>=0 && !a[x-1][y]) a[--x][y]=++tot;
        while(y+1<n && !a[x][y+1]) a[x][++y]=++tot;
    }
    for(x=0;x<n;x++){
        for(y=0;y<n;y++) printf("%3d",a[x][y]);
        printf("\n");
    }
    return 0;
}