#include <bits/stdc++.h>
using namespace std;
bool ss(int n){
    bool r=true;
    if(n<=2) r=false;
    else {
        for(int j=2;j<=sqrt(n);j++){
            if(n%j==0){
            r=false;
            break;
            }   
        }   
    }
    return r;
    }   
int main(){
    int i,n;
    cin>>n;
    for(i=1;i<=n-2;i++){
        if(ss(i)&&ss(i+2)){
            cout<<i<<" "<<i+2<<endl;
        }
    }       
    return 0;
}
/**************************************************************
	Problem: 1139
	User: chenlingxuan
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/