#include<bits/stdc++.h>
using namespace std;
int sushu(int n)
{
	int cnt = 0;
	for(int i=2;i<=sqrt(n);i++)
	{
		if(n%i==0)
		{
			cnt++;
			break;
		}
	}
	if(cnt==0&&n>1)return 1;
	else return 0;
}
int main()
{
	int n;
	cin>>n;
	for(int i=1;i<=n-2;i++)
	{
		for(int j=1;j<=n;j++)
		{
			if(sushu(j)==1&&sushu(i)==1&&j-i==2)
			{
				cout<<i<<" "<<j<<endl;
			}
		}
	}
}
/**************************************************************
	Problem: 1139
	User: wangyuxin
	Language: C++
	Result: Accepted
	Time:16 ms
	Memory:2072 kb
****************************************************************/