#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	if(n%2==0){
}	    cout<<"2"<<endl;
    if(n%3==0){
    }
	cout<<"3"<<endl;
	
	if(n%5==0){
}	
	    cout<<"5"<<endl;
    if(n%7==0){
    	cout<<"7"<<endl;
    }
}
/**************************************************************
	Problem: 1299
	User: fuyijun
	Language: C++
	Result: Wrong Answer
****************************************************************/