rt，本地可以洛谷不行

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