#include<bits/stdc++.h>
using namespace std;
int main(){
	int i,j,c=0,d=0,k,n; 
    cin>>n;
    for(i=2;i<=n;i++){
    	for(j=1;j<=i;j++){
    		if(i%j==0){
    			c++;
    		} 
		} 
		for(k=1;k<=i+2;k++){
    		if((i+2)%k==0){
    			d++;
    		} 
		} 
		if(c<=2&&d<=2){
			cout<<i<<" "<<i+2<<endl; 
		}
		c=0;
		d=0;
  	}
	return 0;
}

/**************************************************************
	Problem: 1139
	User: xuanhua
	Language: C++
	Result: Wrong Answer
****************************************************************/