#include <bits/stdc++.h>
using namespace std;
int s(int n){
	int i,c=0;
	for(i=2;i<=sqrt(n);i++){
		if(n%i==0){
			c=1;
			break;
		}
	}
	return c;
}
int main(){
	int i,n;
	cin>>n;
	for(i=2;i<=n;i++){
		if(s(i)==0&&s(i+2)==0){
			cout<<i<<" "<<i+2<<endl;
		}
	}

    return 0;
}
/**************************************************************
	Problem: 1139
	User: 15159808820
	Language: C++
	Result: Wrong Answer
****************************************************************/