import math
def suShu(n):
        f = True
        for i in range (2 , int(math.sqrt(n))+1):
                if n % i == 0:
                    f = False
                    break
        return f and n != 1
n = int(input())
for i in range (4, n+1):
        if suShu(i) and suShu(i - 2):
                print(i - 2, i)

/**************************************************************
	Problem: 1139
	User: admin
	Language: Python
	Result: Accepted
	Time:140 ms
	Memory:34480 kb
****************************************************************/