N=int(input())
r=list(range(1,N+1))
p1=r[:]
p2=r[:][::-1]
if N%2==0:
    mi=1
    ma=N
    for i in range(N//2):
        p1[i*2]=mi
        p1[i*2+1]=ma
        p2[i*2+1]=mi
        p2[i*2]=ma
        mi+=1
        ma-=1
    p2=p2[::-1]
b=[[0]*N for i in range(N)]
for i in range(N):
    if i%2==0:
        print(*p1)
    else:
        print(*p2)
    for j in range(N):
        b[j][i]=r[j]
    r=r[::-1]
for i in b:
    print(*i)