#include<bits/stdc++.h>
using namespace std;
bool ss(int n){
	bool r=true;
	if(n<=1) r=false;
	else if(n==2) r=true;
	else{
		for(int i=2;i<=sqrt(n);i++){
			if(n%i==0){
				r=false;
				break;
			}
		}
	}
	return r;
}
int main(){
	int n;
	cin>>n;
	for(int i=1;i<=n;i++){
		if(ss(i)&&ss(i+2)) cout<<i<<" "<<(i+2)<<endl;
	}
	return 0;
}

/**************************************************************
	Problem: 1139
	User: zhuanghaoxiang
	Language: C++
	Result: Wrong Answer
****************************************************************/