소스 코드 제출

# d = []
# p = []
# f = []
# for i in range(25):
#     p = list(map(int, input().split()))
#     d.append(p)
#     f.append(p)
# for i in range(1, 24):
#     for j in range(1, 24):
#         k = 0
#         if f[i][j] == 0:
#             for x in range(3):
#                 for y in range(3):
#                     if f[i+x-1][j+y-1] == 1:
#                         k += 1
#                     else:
#                         pass
#             if k == 3:
#                 d[i][j] = 1
#             else:
#                 pass
#         else:
#             for x in range(-1, 2):
#                 for y in range(-1, 2):
#                     if f[i+x][j+y] == 1:
#                         k += 1
#                     else:
#                         pass
#             k -= 1
#             if k>=4 or k<=1:
#                 d[i][j] = 0
#             else:
#                 pass
# for i in range(25):
#     for j in range(25):
#         print(d[i][j], end=' ')
#     print()

# d=[]
# p=[]
# for i in range(100):
#     for j in range(100):
#         p.append(0)
#     d.append(p)
#     p=[]
# for k in range(4):
#     x1, x2, y1, y2=map(int, input().split())
#     for x in range(x2, y2):
#         for y in range(x1, y1):
#             d[x][y]=1
# f=0
# for i in range(100):
#     for j in range(100):
#         if d[i][j]==1:
#             f+=1
#         else:
#             pass
# print(f)

p=[]
d=[]
n=int(input())
for i in range(n):
    for j in range(n):
        p.append(0)
    d.append(p)
    p=[]
x=0
y=0
k=0
f=1
while f<=n*n:
    if k==0:
        if y<n and d[x][y]==0:
            d[x][y]=f
            y+=1
            f += 1
        else:
            k=1
            x+=1
            y-=1
    elif k==1:
        if x<n and d[x][y]==0:
            d[x][y]=f
            x+=1
            f += 1
        else:
            k=2
            y-=1
            x-=1
    elif k==2:
        if 0<=y and d[x][y]==0:
            d[x][y]=f
            y-=1
            f += 1
        else:
            k=3
            x-=1
            y+=1
    else:
        if 0<=x and d[x][y]==0:
            d[x][y]=f
            x-=1
            f += 1
        else:
            k=0
            y+=1
            x+=1


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