#include<bits/stdc++.h>
using namespace std;
bool ss(int n){
    bool f=true;
    for(int i=2;i<=sqrt(n);i++){
        if(n%i==0){
            f=false;
            break;
        }
    }
    return  f;
}
int main(){
    int n;
    cin>>n;
    for(int i=2;i<=n-2;i++){
        if(ss(i)&&ss(i+2)) cout<<i<<" "<<i+2<<endl;
    } 
 
    return 0;
}
 
 
/**************************************************************
	Problem: 1139
	User: chenjiahui
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/