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

/**************************************************************
	Problem: 1139
	User: fzy001
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/