#include<bits/stdc++.h>
using namespace std;
int pdss(int a)
{
	int cnt=0;
	for(int i=2;i<a;i++)
	{
		if(a%i==0)
		{
			cnt=1;
			return 0;
			break;
		}
	}
	if(cnt==0)
	{
		return 1;
	}
}
int main()
{
    int n;
    cin>>n;
    for(int i=2;i<=n-2;i++)
    {
    	if(pdss(i)==1 && pdss(i+2)==1)
    	{
    		cout<<i<<" "<<i+2<<endl;
		}
	}
	return 0;
}
/**************************************************************
	Problem: 1139
	User: chenkexin
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2072 kb
****************************************************************/