#include<bits/stdc++.h>
using namespace std;
int b(int q){
	bool o=1;
	if(q<2)
	o=0;
	else{
		for(int i=2;i<q;i++){
			if(q%i==0){
				o=0;
				break;
			}
		}
	}
	return o;
}
int main()
{
	bool o=1;
	int n,t;
	cin>>n;
	for(int i=3;i<n;i++){
		if(b(i)==1&&b(i+2)==1)
		cout<<i<<" "<<i+2<<endl; 
	}	
return 0;
}

/**************************************************************
	Problem: 1139
	User: houshanglin
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2072 kb
****************************************************************/