#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=2;i<=n-2;i++){
		if(ss(i)&&ss(i+2))cout<<i<<" "<<i+2<<endl;
	}


	return 0;
}

/**************************************************************
	Problem: 1139
	User: wuzihang
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/