#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;
int a;
for(int i=2;i<=n-2;i++) {
	if(ss(i)&&ss(i+2)){
		cout<<i<<" "<<i+2<<endl;
	}
}
	return 0;
}

/**************************************************************
	Problem: 1139
	User: linweilun
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/