Spyral

n = int(input())
a = [[0 for i in range(n)] for i in range(n)]
num = 0
y = 0
x = 0

for j in range(n):
    num += 1
    a[0][j] = num

for k in range(n - 1, 0, -1):
    x += 1
    y += 1
    for i in range(k):
        if a[i+1][-y] == 0:
            num += 1
            a[i+1][-y] = num

    for j in range(k):
        if a[-x][-(j+2)] == 0:
            num += 1
            a[-x][-(j+2)] = num

    for i in range(k-1):
        if a[-(i+2)][y-1] == 0:
            num += 1
            a[-(i+2)][y-1] = num

    for j in range(k-1):
        if a[x][j+1] == 0:
            num += 1
            a[x][j+1] = num

for i in range(n):
    for j in range(n):
        print(a[i][j], end=' ')
    print()