n = int(input())
a = [[0]*(n) for i in range(n)]
value = 1
x,y = 0,0
a[x][y] = value
while value < n*n:
        while y+1 < n and a[x][y+1] == 0:#往右走
            y += 1
            value += 1
            a[x][y] = value
        while x+1 < n and a[x+1][y] == 0:  # 往下
            x += 1
            value += 1
            a[x][y] = value
        while  0 <= y -1 and a[x][y-1] == 0:#往左走
            y -= 1
            value += 1
            a[x][y] = value
        while 0 <= x - 1 and a[x-1][y] == 0:#往上走
            x -= 1
            value += 1
            a[x][y] = value
for i in range(n):
    for j in range(n):
        print(f"{a[i][j]:3d}",end=" ")
    print()