#include<bits/stdc++.h>
using namespace std;
bool ss(int n){
    bool r=true;
    if(n<2) r=false;
    else{
        for(int i=2;i<=sqrt(n);i++){
            if(n%i==0){
                r=false;
                break;
            }
        }
    }
 
    return r;
}
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: lijinkai
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/