不会的看我！！！

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