题解

#include<bits/stdc++.h> 
using namespace std;
int main(){
	int n;
	cin>>n;
	if(n%3==0 and n%5==0 and n%7==0) cout<<"3 5 7";
	else if(n%3==0 and n%5==0) cout<<"3 5";
	else if(n%3==0 and n%7==0) cout<<"3 7";
	else if(n%5==0 and n%7==0) cout<<"5 7";
	else if(n%3==0) cout<<"3";
	else if(n%5==0) cout<<"5";
	else if(n%7==0) cout<<"7";
	else cout<<"n";
	return 0;
}