N=int(input())
L=[1 for i in range(N+1)]
for i in range(2,N+1):
    for j in range(1,N+1):
        if i*j<=N:
            L[i*j]+=1
#print(L)
SA=10**9
ans=[]
for i in range(1,(N+1)//2):
    A=i-L[i]
    B=(N-i)-L[(N-i)]
    if abs(A-B)<SA:
        SA=abs(A-B)
        ans=[[i,N-i]]
    elif abs(A-B)==SA:
        ans.append([i,N-i])
for i in ans:
    print(*i)
ANS=ans[::-1]
for i in ANS:
    print(i[1],i[0])