#include <bits/stdc++.h>
using namespace std;
bool a(int n){
    bool l=true;
    if(n<=2) l=false;
    else {
        for(int j=2;j<=sqrt(n);j++){
            if(n%j==0){
            l=false;
			break; 
            
            }   
        }   
    }
    return l;
}   
int main(){
    int i,n;
    cin>>n;
    for(i=1;i<=n-2;i++){
        if(a(i)&&a(i+2)){
            cout<<i<<" "<<i+2<<endl; 
        }
    }       
    return 0;
    }

/**************************************************************
	Problem: 1139
	User: fuyijun
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2072 kb
****************************************************************/