#include<bits/stdc++.h>
using namespace std;
bool k(int m){
	if(m<=1) return false;
	if(m==2) return true;
	for(int i=2;i<=sqrt(m);i++){
		if(m%i==0) return false;
	}
	return true;
}
int main(){
	int n;
	cin>>n;
	for(int i=1;i<=n;i++){
		if(k(i)&&k(i+2)) cout<<i<<" "<<i+2<<endl;
	}
}
/**************************************************************
	Problem: 1139
	User: wangyiyang
	Language: C++
	Result: Wrong Answer
****************************************************************/