#include<bits/stdc++.h>
using namespace std;
bool a(int b){
	if(b<=1)return false;
	if(b==2)return true;
	if(b%2==0)return false;
	for(int i=3;i*i<=b;i+=2){
		if(b%i==0)return false;
	}
	return true;
}
int main(){
	int n;
	freopen("twinprime.in","r",stdin);
	freopen("twinprime.out","w",stdout);
	cin>>n;
	for(int i=2;i<=n-2;i++){
		if(a(i)==true&&a(i+2)==true){
			cout<<i<<" "<<i+2<<endl;
		}
	}
	return 0;
}