#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-2;i++){
        if(s(i)==0&&s(i+2)==0){
            cout<<i<<" "<<i+2<<endl;
        }
    }
	return 0;
}

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