#include<bits/stdc++.h>
using  namespace std;
int s(int n)
{
	int i,c=0;
	for(i=2;i<=sqrt(n);i++)
	{
		if(n%i==0)
		{
		c=1;
		break;
		}
		
	}
	return c;
}
int main()
{
	int n,i;
	cin>>n;
	for(i=2;i<=n-2;i++)
	{
		if(s(i)==0&&s(i+2)==0)
		{
			cout<<i<<" "<<i+2<<endl;
		}
	}
	return 0;
}
/**************************************************************
	Problem: 1139
	User: chenzhuo1
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2072 kb
****************************************************************/