#include<bits/stdc++.h>
using namespace std;
bool ss(int n){
	bool r=true;
	if(n<2) r=false;
	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: chenyaohuo
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/