n = int(input())
a = [[0 for j in range(n)] for i in range(n)]
jmin = 0
imin = 1
jmax = n-1
imax = n-1
k = 1
while True:
    for j in range(jmin, jmax+1, 1):
        a[imin-1][j] = k
        k += 1
    for i in range(imin, imax+1, 1):
        a[i][jmax] = k
        k += 1
    jmax -= 1
    for j in range(jmax, jmin-1, -1):
        a[imax][j] = k
        k += 1
    imax -= 1
    for i in range(imax, imin-1, -1):
        a[i][jmin] = k
        k += 1
    imin += 1
    jmin += 1
    if k > n ** 2:
        break
for i in range(n):
    for j in range(n):
        print(a[i][j], end=' ')
    print()