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