from random import shuffle

# N偶数は正しくないよ！

N=int(input())
if N<=3:
    print("No")
    exit()
if N%2==0:
    exit(0) #こんなケースは存在しないので
P=list(range(1,N-1))
p=[]
while True:
    shuffle(P)
    p=[0]+P+[N-1]
    flg=True
    for i in range(1,N):
        if i%2==0:
            if p[i-1]==p[i]+1:
                flg=False
        else:
            if p[i-1]==p[i]-1:
                flg=False
    if flg:
        break
P=[]
for i in range(N):
    rng=range(i*N,(i+1)*N)
    if i%2==1:
        rng=reversed(rng)
    for j in rng:
        P.append(j)
dnt=set()
for i in range(1,N):
    dnt.add(i*N+p[i])
for i in range(N*N-1):
    if P[i] not in dnt:
        print(P[i]+1,P[i+1]+1)
    else:
        print(P[i+1]+1-N,P[i+1]+1)