#include<bits/stdc++.h>
using namespace std;
bool s(int n){
	bool r=true;
	for(int i=2;i<=sqrt(n);i++){
		if(n%i==0){
			r=false;
		}
	}
	return r;
}
int main(){
	int n;
	cin>>n;
	for(int i=2;i<=n-2;i++){
		if(s(i)&&s(i+2)){
			cout<<i<<" "<<i+2<<endl;
		}
	}

	return 0;
}
/**************************************************************
	Problem: 1139
	User: panyuchen
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2072 kb
****************************************************************/