#include <bits/stdc++.h>
using namespace std;
bool ss(int n){
	bool f=1;
	for(int i=2;i<=sqrt(n);i++){
		if(n%i==0){
			f=0;
			break;
		}
	}
	return f;
}

int main(){
	int n;
	cin>>n;
	for(int i=2;i<=n-2;i++){
		if(ss(i)&&ss(i+2)){
			cout<<i<<" "<<i+2<<endl;
		}
	} 
	return 0;
}

/**************************************************************
	Problem: 1139
	User: tangkaixuan
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/