n = int(input())
lst = []
s = 1
l = (n+1)//2+1
for i in range(n):
    if i%2 == 0:
        lst.append(s)
        s += 1
    else:
        lst.append(l)
        l += 1
a = [lst[i:] + lst[:i] for i in range(n)]

for i in range(n):
    print(*a[i])