def isPrime(n): if n<2: return False for x in range(2,int(n**0.5)+2): if n%x ==0: return False return True n = int(input()) flag = False for t in range(2,n+1): if isPrime(t) and t+2<=n and isPrime(t+2): print(t,t+2) flag = True if flag == False: print("No")